- A
Azure Blob Storage with Append Blobs and an immutable blob policy
Correct. Append Blobs are ideal for append operations, and immutability provides tamper-proof storage. Cost-effective for high-volume writes.
- B
Azure Data Lake Storage Gen2 with Append Blobs and immutability
Why wrong: Incorrect. While technically possible, Data Lake Storage Gen2 adds cost for the hierarchical namespace and is more suited for analytics purposes, not just append-only immutability.
- C
Azure Files with immutable shares
Why wrong: Incorrect. Azure Files provides SMB/NFS file shares, but immutability is not available for all tiers and append writes are not efficient.
- D
Azure NetApp Files with immutability
Why wrong: Incorrect. Azure NetApp Files is a high-performance file share for enterprise workloads, not optimized for append-only immutability and is cost-prohibitive for large-scale append data.
Quick Answer
The correct choice is Azure Blob Storage with Append Blobs and an immutable blob policy. This combination directly addresses the need for immutable append blobs for compliance storage because Append Blobs are specifically designed for high-throughput append-only operations like logging or audit trails, while the immutable blob policy enforces Write Once, Read Many (WORM) protection, preventing any modification or deletion during the retention period. On the AZ-204 exam, this scenario tests your understanding of Azure Storage tiers and data governance—expect it in a case study about compliance or regulatory logging. A common trap is choosing Azure Data Lake Storage Gen2, which lacks native append-only optimization, or assuming that cool tier alone provides immutability. Memory tip: think “Append + Immutable = WORM for logs,” and remember that Append Blobs can be stored in cool or archive tiers to minimize cost while maintaining high write throughput.
AZ-204 Develop for Azure storage Practice Question
This AZ-204 practice question tests your understanding of develop for azure storage. 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.
You need to store a large (terabytes) append-only dataset for compliance purposes. The data must be immutable to prevent tampering after writes. You also want to minimize storage cost and achieve high write throughput. Which Azure Storage solution should you 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
Azure Blob Storage with Append Blobs and an immutable blob policy
Azure Blob Storage with Append Blobs and an immutable blob policy is correct because Append Blobs are optimized for append-only operations (e.g., logging, audit trails) and support high write throughput. Immutable blob policies (WORM – Write Once, Read Many) enforce data immutability at the blob level, preventing modification or deletion during the retention period, which meets compliance requirements. This combination minimizes storage cost by using the cool or archive tier for Append Blobs, while still achieving the required write performance.
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.
- ✓
Azure Blob Storage with Append Blobs and an immutable blob policy
Why this is correct
Correct. Append Blobs are ideal for append operations, and immutability provides tamper-proof storage. Cost-effective for high-volume writes.
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 Data Lake Storage Gen2 with Append Blobs and immutability
Why it's wrong here
Incorrect. While technically possible, Data Lake Storage Gen2 adds cost for the hierarchical namespace and is more suited for analytics purposes, not just append-only immutability.
- ✗
Azure Files with immutable shares
Why it's wrong here
Incorrect. Azure Files provides SMB/NFS file shares, but immutability is not available for all tiers and append writes are not efficient.
- ✗
Azure NetApp Files with immutability
Why it's wrong here
Incorrect. Azure NetApp Files is a high-performance file share for enterprise workloads, not optimized for append-only immutability and is cost-prohibitive for large-scale append data.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Azure Data Lake Storage Gen2 (which is just Blob Storage with a hierarchical namespace) as having separate immutability features, but immutability is a Blob Storage capability that works identically on Data Lake Storage Gen2; however, the question's append-only requirement is best met by Append Blobs in standard Blob Storage, not by adding the hierarchical namespace overhead of Data Lake Storage Gen2.
Detailed technical explanation
How to think about this question
Append Blobs are composed of blocks and are optimized for append operations, with each append adding a block to the end; they support up to 195 GB per blob and can achieve high throughput by batching appends. Immutable blob policies use a time-based retention policy or legal hold, enforced at the storage account or container level, which prevents any writes (including overwrites) or deletes until the retention period expires. In real-world scenarios, this is commonly used for storing audit logs, financial records, or IoT telemetry data where tamper-proofing is critical and cost is minimized by tiering to cool or archive storage.
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.
- →
Develop for Azure storage — study guide chapter
Learn the concepts, then practise the questions
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Develop for Azure storage practice questions
Targeted practice on this topic area only
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All AZ-204 questions
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Microsoft Azure Developer Associate AZ-204 study guide
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AZ-204 practice test guide
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FAQ
Questions learners often ask
What does this AZ-204 question test?
Develop for Azure storage — This question tests Develop for Azure storage — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Azure Blob Storage with Append Blobs and an immutable blob policy — Azure Blob Storage with Append Blobs and an immutable blob policy is correct because Append Blobs are optimized for append-only operations (e.g., logging, audit trails) and support high write throughput. Immutable blob policies (WORM – Write Once, Read Many) enforce data immutability at the blob level, preventing modification or deletion during the retention period, which meets compliance requirements. This combination minimizes storage cost by using the cool or archive tier for Append Blobs, while still achieving the required write performance.
What should I do if I get this AZ-204 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.
About these practice questions
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Last reviewed: Jun 11, 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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