- A
Use blob lifecycle management policies and legal hold (immutable blobs).
Why wrong: Legal hold prevents deletion but does not enforce a specific retention period and is not designed for automated tiering. Time-based retention is more appropriate for a 7-year fixed period.
- B
Use blob lifecycle management policies and time-based retention policies.
Lifecycle management automates tier transitions. Time-based retention allows you to set a policy that prevents deletion or modification for a specified period (e.g., 7 years).
- C
Use Azure Storage Analytics and immutability policies.
Why wrong: Storage Analytics provides logs and metrics, not automated tiering or retention. Immutability policies (whether legal hold or time-based) are separate, but this combination does not include lifecycle management.
- D
Use Azure File Sync and lifecycle management.
Why wrong: Azure File Sync is for syncing file shares, not for blob storage. It does not support blob tiering or immutability features.
Quick Answer
The correct combination is blob lifecycle management policies and time-based retention policies. Lifecycle management policies automate tier transitions, moving blobs from hot to cool after 30 days and to archive after 90 days based on age, while time-based retention policies enforce immutability by locking blobs for a fixed 7-year period, preventing any deletion or modification. On the AZ-305 exam, this scenario tests your ability to separate storage tiering automation from compliance-driven data protection, as both features are often conflated. A common trap is assuming that immutability alone handles tiering or that lifecycle policies can enforce retention—they cannot. Remember the mnemonic “Lifecycle for tiers, Retention for locks” to keep the roles distinct.
AZ-305 Design data storage solutions Practice Question
This AZ-305 practice question tests your understanding of design data storage solutions. 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.
A company needs a data storage solution for a global application that frequently accesses recent data and less frequently older data. Data is unstructured blobs. They want to automatically move blobs to cool storage after 30 days and to archive storage after 90 days. Additionally, blobs must be retained for 7 years and cannot be deleted or modified during that period. Which Azure Blob Storage features should they combine?
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
Use blob lifecycle management policies and time-based retention policies.
Option B is correct because blob lifecycle management policies automatically transition blobs from hot to cool after 30 days and to archive after 90 days, while time-based retention policies enforce immutability for a fixed period (7 years), preventing deletion or modification. This combination meets both the tiering and retention requirements without manual intervention.
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.
- ✗
Use blob lifecycle management policies and legal hold (immutable blobs).
Why it's wrong here
Legal hold prevents deletion but does not enforce a specific retention period and is not designed for automated tiering. Time-based retention is more appropriate for a 7-year fixed period.
- ✓
Use blob lifecycle management policies and time-based retention policies.
Why this is correct
Lifecycle management automates tier transitions. Time-based retention allows you to set a policy that prevents deletion or modification for a specified period (e.g., 7 years).
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use Azure Storage Analytics and immutability policies.
Why it's wrong here
Storage Analytics provides logs and metrics, not automated tiering or retention. Immutability policies (whether legal hold or time-based) are separate, but this combination does not include lifecycle management.
- ✗
Use Azure File Sync and lifecycle management.
Why it's wrong here
Azure File Sync is for syncing file shares, not for blob storage. It does not support blob tiering or immutability features.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is confusing legal hold (which is indefinite and manually managed) with time-based retention (which has a fixed expiry), leading candidates to choose Option A when they need a defined retention period.
Detailed technical explanation
How to think about this question
Blob lifecycle management uses rules based on 'last modified' or 'creation time' to execute tiering actions (e.g., 'tierToCool' after 30 days, 'tierToArchive' after 90 days). Time-based retention policies are part of immutable blob storage, which uses a WORM (Write Once, Read Many) model; once set, blobs cannot be deleted or overwritten until the retention interval expires, even by account owners. This combination is ideal for compliance scenarios like financial records or medical imaging where data must be preserved for a statutory period.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this AZ-305 question test?
Design data storage solutions — This question tests Design data storage solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use blob lifecycle management policies and time-based retention policies. — Option B is correct because blob lifecycle management policies automatically transition blobs from hot to cool after 30 days and to archive after 90 days, while time-based retention policies enforce immutability for a fixed period (7 years), preventing deletion or modification. This combination meets both the tiering and retention requirements without manual intervention.
What should I do if I get this AZ-305 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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-305 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-305 exam.
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