Quick Answer
The answer is to combine Azure Blob Storage with a time-based retention policy and the Cool or Archive access tier. This trio works because Blob Storage supports immutable storage through a WORM (Write Once, Read Many) policy, which legally prohibits any modification or deletion until the retention period expires—critical for compliance archiving where data must be stored for 7 years. The Cool or Archive tier minimizes storage costs by automatically moving infrequently accessed data to lower-cost media, while the time-based retention policy enforces the exact 7-year hold. On the AZ-204 exam, this scenario tests your ability to pair cost optimization with regulatory controls; a common trap is choosing a hot tier or forgetting that immutable policies override standard lifecycle management. Memory tip: think “WORM in a COOL vault” to link Write Once, Read Many with the cost-saving Cool or Archive tier for long-term compliance.
This AZ-204 practice question tests your understanding of develop for azure storage. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
You are designing a data archiving solution for compliance. Data must be stored for 7 years, with immediate deletion prohibited until the retention period expires. The solution must minimize storage costs while ensuring data is not modifiable. Which THREE Azure features should you combine?
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.
Azure Blob Storage
Base storage for archiving data.
Immutable storage with time-based retention policy
Prevents deletion/modification for a set period.
Azure Files
Why wrong: Not suitable for blob archiving.
Cool or Archive access tier
Reduces cost for long-term archived data.
Azure Backup
Why wrong: Backup service, not archiving with immutability.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Azure Blob Storage
Azure Blob Storage is the correct foundational service because it supports immutable storage, which enforces a WORM (Write Once, Read Many) policy. This ensures data cannot be modified or deleted during the retention period, meeting compliance requirements. Combined with time-based retention policies and cool/archive tiers, it provides a cost-effective, unmodifiable archive solution.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Azure Blob Storage
Why this is correct
Base storage for archiving data.
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.
Immutable storage with time-based retention policy
Why this is correct
Prevents deletion/modification for a set period.
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.
Azure Files
Why it's wrong here
Not suitable for blob archiving.
Cool or Archive access tier
Why this is correct
Reduces cost for long-term archived data.
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.
Azure Backup
Why it's wrong here
Backup service, not archiving with immutability.
Common exam traps
The trap here is that candidates often confuse Azure Files or Azure Backup as viable archiving solutions, overlooking that only Blob Storage with immutable policies provides the WORM guarantee required for compliance-driven data retention.
Detailed technical explanation
Immutable storage in Azure Blob Storage uses a time-based retention policy that locks a container or blob version, preventing any writes or deletes until the retention interval expires. The policy is enforced at the storage account level via a legal hold or time-based retention, and the retention clock starts when the policy is applied. In practice, this is critical for industries like finance or healthcare where regulations (e.g., SEC 17a-4, HIPAA) require data to be stored in a non-erasable, non-rewritable format for a fixed period.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Develop for Azure storage — study guide chapter
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FAQ
Develop for Azure storage — This question tests Develop for Azure storage — Read the scenario before looking for a memorised answer..
The correct answer is: Azure Blob Storage — Azure Blob Storage is the correct foundational service because it supports immutable storage, which enforces a WORM (Write Once, Read Many) policy. This ensures data cannot be modified or deleted during the retention period, meeting compliance requirements. Combined with time-based retention policies and cool/archive tiers, it provides a cost-effective, unmodifiable archive solution.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
This AZ-204 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-204 exam.
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