- A
Leave logs in S3 Standard for 18 months and add a tag for internal reporting
Why wrong: Tagging does not reduce storage cost; the logs still remain in the most expensive class.
- B
Create an S3 lifecycle policy to transition logs to Standard-IA after 30 days and to Glacier Deep Archive after 180 days
Storage class transitions align cost with access frequency while still keeping objects for the full compliance period.
- C
Immediately move all logs to Glacier Instant Retrieval and expire after 18 months
Why wrong: Instant Retrieval can be useful, but moving all logs immediately increases retrieval cost and may be inefficient for hot first-30-day access.
- D
Enable versioning and rely on object lifecycle expiration to reduce costs; do not change storage classes
Why wrong: Versioning and expiration may change storage volume but it does not address the primary cost driver: storage class.
Quick Answer
The answer is to create an S3 lifecycle policy that transitions logs to Standard-IA after 30 days and to Glacier Deep Archive after 180 days. This is correct because lifecycle policies automate cost optimization by moving data through storage tiers based on changing access patterns—Standard-IA reduces cost for rarely accessed data, while Glacier Deep Archive provides the lowest storage cost for archival data that is almost never accessed, perfectly matching the 30-day heavy access and 180-day near-zero access windows while retaining logs for the full 18-month compliance period. On the SAA-C03 exam, this scenario tests your ability to map access patterns to the correct S3 storage classes and lifecycle transitions; a common trap is choosing Glacier Flexible Retrieval instead of Deep Archive, but remember that Deep Archive is for data accessed less than once a year. Memory tip: think "30-180-Deep" for the three key numbers: 30 days to IA, 180 days to Deep Archive.
SAA-C03 Design Cost-Optimized Architectures Practice Question
This SAA-C03 practice question tests your understanding of design cost-optimized architectures. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A team stores application logs in an S3 bucket. They keep logs for 18 months for compliance. Access patterns: logs are heavily accessed during the first 30 days, rarely accessed between days 31 and 180, and almost never accessed after day 180. They currently store everything in S3 Standard and want to reduce storage cost without violating the 18-month retention requirement. What should they implement?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"first"Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Clue:
"never"Why it matters: Absolute qualifier. True only if the statement has zero exceptions — be cautious of options that seem obvious but break down in edge cases.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Create an S3 lifecycle policy to transition logs to Standard-IA after 30 days and to Glacier Deep Archive after 180 days
Option B is correct because an S3 lifecycle policy can automatically transition objects from S3 Standard to S3 Standard-IA after 30 days (matching the heavy-access period) and then to S3 Glacier Deep Archive after 180 days (matching the near-zero-access period). This minimizes storage costs while retaining logs for the required 18 months, as Glacier Deep Archive offers the lowest storage cost for long-term archival data.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Leave logs in S3 Standard for 18 months and add a tag for internal reporting
Why it's wrong here
Tagging does not reduce storage cost; the logs still remain in the most expensive class.
- ✓
Create an S3 lifecycle policy to transition logs to Standard-IA after 30 days and to Glacier Deep Archive after 180 days
Why this is correct
Storage class transitions align cost with access frequency while still keeping objects for the full compliance period.
Clue confirmation
The clue words "first", "never" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Immediately move all logs to Glacier Instant Retrieval and expire after 18 months
Why it's wrong here
Instant Retrieval can be useful, but moving all logs immediately increases retrieval cost and may be inefficient for hot first-30-day access.
- ✗
Enable versioning and rely on object lifecycle expiration to reduce costs; do not change storage classes
Why it's wrong here
Versioning and expiration may change storage volume but it does not address the primary cost driver: storage class.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may choose Option C, mistakenly thinking Glacier Instant Retrieval is the cheapest archival class, but it is actually more expensive than Glacier Deep Archive for data that is almost never accessed, and the immediate transition ignores the cost savings from using Standard-IA during the first 30 days.
Detailed technical explanation
How to think about this question
S3 lifecycle policies evaluate objects based on their creation date and can transition to lower-cost storage classes (e.g., Standard-IA after 30 days, Glacier Deep Archive after 180 days) with a minimum 30-day transition interval between non-current tiers. Glacier Deep Archive has a retrieval time of 12–48 hours and a minimum storage duration of 180 days, making it ideal for data that is almost never accessed but must be retained for compliance. The 18-month retention is achieved by setting an expiration action after 18 months (547 days) to delete the objects automatically.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this SAA-C03 question test?
Design Cost-Optimized Architectures — This question tests Design Cost-Optimized Architectures — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create an S3 lifecycle policy to transition logs to Standard-IA after 30 days and to Glacier Deep Archive after 180 days — Option B is correct because an S3 lifecycle policy can automatically transition objects from S3 Standard to S3 Standard-IA after 30 days (matching the heavy-access period) and then to S3 Glacier Deep Archive after 180 days (matching the near-zero-access period). This minimizes storage costs while retaining logs for the required 18 months, as Glacier Deep Archive offers the lowest storage cost for long-term archival data.
What should I do if I get this SAA-C03 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "first", "never". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Same concept, more angles
2 more ways this is tested on SAA-C03
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A media company stores application logs in S3. The logs must be kept for 400 days. They are read heavily for the first 30 days, occasionally for the next 90 days, and almost never after that. Retrieval after the first 3 months can wait a few hours. Which three lifecycle actions should they use to minimize storage cost? Select three.
medium- ✓ A.Transition objects to S3 Standard-IA after 30 days.
- ✓ B.Transition objects to S3 Glacier Flexible Retrieval after 90 days.
- ✓ C.Expire objects after 400 days.
- D.Keep all objects in S3 Standard for the full retention period.
- E.Transition objects to S3 One Zone-IA after 30 days.
Why A: Option A is correct because after the initial 30-day period of heavy reads, transitioning objects to S3 Standard-IA reduces storage costs while still providing low-latency retrieval for the occasional access needed over the next 90 days. S3 Standard-IA is designed for data accessed infrequently but requires rapid access when needed, making it cost-effective for this usage pattern.
Variation 2. A solutions architect is designing a cost-optimized data storage solution for a large dataset that is accessed infrequently but must be retained for compliance for 7 years. Which three actions should the architect take to minimize costs? (Choose three.)
medium- .Store the data in Amazon S3 Glacier Deep Archive immediately after creation.
- ✓ .Use Amazon S3 lifecycle policies to transition data from S3 Standard to S3 Glacier Deep Archive after 30 days.
- ✓ .Enable S3 Intelligent-Tiering to automatically move data between access tiers based on usage patterns.
- .Store all data in Amazon EBS gp2 volumes attached to an EC2 instance for low-latency access.
- ✓ .Use S3 Object Lock in compliance mode to prevent data deletion during the retention period.
- .Replicate all data to a second AWS Region using S3 Cross-Region Replication to ensure durability.
Why : Amazon S3 lifecycle policies allow you to define rules that automatically transition objects to colder storage tiers like S3 Glacier Deep Archive after a specified period. This approach minimizes costs by keeping data in S3 Standard only for the initial 30 days when it might be accessed, then moving it to the lowest-cost storage class for the remaining compliance period. S3 Intelligent-Tiering automatically optimizes costs by monitoring access patterns and moving data between frequent, infrequent, and archive access tiers without manual intervention. S3 Object Lock in compliance mode prevents any user, including the root user, from deleting or overwriting objects during the retention period, ensuring regulatory compliance.
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Last reviewed: Jun 11, 2026
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