- A
Hot tier
Why wrong: The Hot tier is optimized for frequent access and has higher storage costs. It is not the most cost-effective choice for data that is accessed only a few times per year.
- B
Cool tier
Why wrong: The Cool tier is for infrequently accessed data with lower storage costs than Hot, but it still charges higher storage fees than Archive and has lower retrieval latency. It is not the cheapest option given the very rare access pattern.
- C
Archive tier
The Archive tier offers the lowest storage costs and is designed for long-term retention of data that is rarely accessed. Retrieval times are measured in hours (up to 15 hours), which matches the company's acceptable delay. This is the most cost-effective choice.
- D
Premium tier
Why wrong: The Premium tier is for high-performance block blob storage with low latency and high storage cost. It is intended for frequently accessed data and interactive workloads, not for archival data with minimal access.
Quick Answer
The answer is the Archive tier, as it is the cheapest Azure Blob storage tier for long-term archival and directly meets the regulatory requirement of retaining historical financial records for 10 years at minimal cost. This tier is designed for data that is rarely accessed—such as during annual audits—and accepts a retrieval delay of up to 15 hours, which fits the acceptable window. On the Microsoft Azure Fundamentals AZ-900 exam, this scenario tests your understanding of how access tiers align with cost optimization and data lifecycle management. A common trap is choosing the Cool tier, which costs more per gigabyte per month and is meant for data accessed every few months, not years. Remember the memory tip: “Archive for ages, Cool for a few, Hot for the now”—if you can wait up to 15 hours and access data only a few times per decade, Archive is the cheapest and correct choice.
AZ-900 Describe Azure architecture and services Practice Question
This AZ-900 practice question tests your understanding of describe azure architecture and services. 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 has a large dataset of historical financial records that must be retained for 10 years to comply with regulatory requirements. The data is accessed only a few times per year during audits. When accessed, a retrieval delay of up to 15 hours is acceptable. The company wants to minimize storage costs for this dataset. Which Azure Blob storage access tier should the company use?
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
Archive tier
The Archive tier is the correct choice because it is the lowest-cost storage tier for data that is rarely accessed and has a flexible retrieval time. With a 10-year retention requirement and only a few accesses per year, the Archive tier's retrieval time of up to 15 hours (actual range is 1–15 hours for standard retrieval) is acceptable, and it minimizes storage costs compared to other tiers.
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.
- ✗
Hot tier
Why it's wrong here
The Hot tier is optimized for frequent access and has higher storage costs. It is not the most cost-effective choice for data that is accessed only a few times per year.
- ✗
Cool tier
Why it's wrong here
The Cool tier is for infrequently accessed data with lower storage costs than Hot, but it still charges higher storage fees than Archive and has lower retrieval latency. It is not the cheapest option given the very rare access pattern.
- ✓
Archive tier
Why this is correct
The Archive tier offers the lowest storage costs and is designed for long-term retention of data that is rarely accessed. Retrieval times are measured in hours (up to 15 hours), which matches the company's acceptable delay. This is the most cost-effective choice.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Premium tier
Why it's wrong here
The Premium tier is for high-performance block blob storage with low latency and high storage cost. It is intended for frequently accessed data and interactive workloads, not for archival data with minimal access.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may choose Cool tier because they see 'rarely accessed' and think Cool is sufficient, but they overlook the 10-year retention and the fact that Archive is specifically designed for data that is accessed only a few times per year with acceptable retrieval delays, offering the lowest cost.
Detailed technical explanation
How to think about this question
The Archive tier stores data offline, meaning the blob is not immediately accessible; you must rehydrate it to Hot or Cool tier before reading, which incurs a retrieval cost and takes up to 15 hours for standard-priority rehydration. For high-priority rehydration, the time is under 1 hour, but this increases cost. The Archive tier is ideal for compliance scenarios where data must be retained for years but accessed infrequently, as it offers the lowest storage cost per GB (approximately $0.002/GB/month vs. $0.01 for Cool and $0.018 for Hot in standard LRS).
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this AZ-900 question test?
Describe Azure architecture and services — This question tests Describe Azure architecture and services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Archive tier — The Archive tier is the correct choice because it is the lowest-cost storage tier for data that is rarely accessed and has a flexible retrieval time. With a 10-year retention requirement and only a few accesses per year, the Archive tier's retrieval time of up to 15 hours (actual range is 1–15 hours for standard retrieval) is acceptable, and it minimizes storage costs compared to other tiers.
What should I do if I get this AZ-900 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 11, 2026
This AZ-900 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the AZ-900 exam.
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