Question 164 of 1,040
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 company is designing a cost-optimized serverless architecture using AWS Lambda for a data processing workload. The workload runs multiple times per day and processes files up to 500 MB. Which three design decisions will help minimize costs? (Choose three.)
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"minimum / minimize"Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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
✓
Optimize the Lambda function code to reduce execution duration, as cost is based on compute time.
Optimizing the Lambda function code to reduce execution duration directly lowers costs because AWS Lambda pricing is based on the number of requests and the duration of code execution, measured in GB-seconds. By writing efficient code, you reduce the compute time, which minimizes the billable GB-seconds. Storing processed output in S3 Standard-IA is cost-effective for infrequently accessed data, as it offers lower storage costs than S3 Standard while still providing high durability and availability. Using S3 batch operations to invoke Lambda functions in parallel reduces the overall processing time by distributing the workload across multiple concurrent invocations, which can lower the total compute duration and thus the cost.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Common exam traps
Common exam trap: answer the scenario, not the keyword
AWS often tests the misconception that more memory always reduces cost because it speeds up execution, but the trap is that cost is a product of memory and duration, so the optimal memory must be empirically determined, not set to the maximum.
Detailed technical explanation
How to think about this question
Lambda's cost model charges per GB-second, meaning that doubling memory (and thus CPU allocation) can halve execution time, but the cost per invocation remains roughly the same if the product of memory and time is constant; however, many workloads see diminishing returns beyond a certain memory threshold. S3 Standard-IA has a minimum storage duration charge of 30 days and a retrieval fee, so it is only cost-effective when objects are accessed less than once per month and stored for longer than 30 days. S3 batch operations can invoke Lambda functions asynchronously, and the concurrency is limited by the account's Lambda concurrency quota, which must be managed to avoid throttling.
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.
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
What to study next
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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: Optimize the Lambda function code to reduce execution duration, as cost is based on compute time. — Optimizing the Lambda function code to reduce execution duration directly lowers costs because AWS Lambda pricing is based on the number of requests and the duration of code execution, measured in GB-seconds. By writing efficient code, you reduce the compute time, which minimizes the billable GB-seconds. Storing processed output in S3 Standard-IA is cost-effective for infrequently accessed data, as it offers lower storage costs than S3 Standard while still providing high durability and availability. Using S3 batch operations to invoke Lambda functions in parallel reduces the overall processing time by distributing the workload across multiple concurrent invocations, which can lower the total compute duration and thus the cost.
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: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
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