Quick Answer
The answer is Azure Blob Storage, as it provides the most cost-effective storage for large binary files like images and videos in Azure. This service is specifically designed for unstructured data, offering tiered pricing (hot, cool, archive) that lets you optimize costs based on access frequency, unlike relational or NoSQL databases. On the Microsoft Azure Developer Associate AZ-204 exam, this question tests your ability to match workload requirements to the correct Azure data service, often appearing as a scenario where you must choose between Blob Storage, SQL Database, Azure Files, or Cosmos DB. A common trap is selecting Azure Files for its familiarity with shared drives, but remember that Blob Storage is purpose-built for massive binary objects at scale and lower cost. Memory tip: think "Blob for blobs"—binary large objects belong in Blob Storage.
This AZ-204 practice question tests your understanding of connect to and consume azure services and third-party 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 developer is building an application that needs to store and retrieve large binary files (e.g., images, videos). The application runs on Azure Virtual Machines. Which Azure service provides the most cost-effective storage for these files?
Azure SQL Database
Why wrong: SQL Database is for relational data, not for storing large binary files cost-effectively.
Azure Cosmos DB
Why wrong: Cosmos DB is a NoSQL database and is more expensive for blob storage.
Azure Files
Why wrong: Azure Files is for file shares, not optimal for large binary files.
Azure Blob Storage
Blob Storage is designed for cost-effective storage of large binary files.
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
Option B is correct because Azure Blob Storage is specifically designed for storing large amounts of unstructured data like binary files at low cost. Option A is incorrect because Azure SQL Database is for relational data, not blob storage. Option C is incorrect because Azure Files is for shared file systems, not optimal for large binary files. Option D is incorrect because Azure Cosmos DB is for NoSQL data and is more expensive for blob storage.
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 SQL Database
Why it's wrong here
SQL Database is for relational data, not for storing large binary files cost-effectively.
Azure Cosmos DB
Why it's wrong here
Cosmos DB is a NoSQL database and is more expensive for blob storage.
Azure Files
Why it's wrong here
Azure Files is for file shares, not optimal for large binary files.
Azure Blob Storage
Why this is correct
Blob Storage is designed for cost-effective storage of large binary files.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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 AZ-204 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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FAQ
Connect to and consume Azure services and third-party services — This question tests Connect to and consume Azure services and third-party services — Read the scenario before looking for a memorised answer..
The correct answer is: Azure Blob Storage — Option B is correct because Azure Blob Storage is specifically designed for storing large amounts of unstructured data like binary files at low cost. Option A is incorrect because Azure SQL Database is for relational data, not blob storage. Option C is incorrect because Azure Files is for shared file systems, not optimal for large binary files. Option D is incorrect because Azure Cosmos DB is for NoSQL data and is more expensive for blob storage.
Identify which AZ-204 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 20, 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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