MS-900 Practice Question: Describe security, compliance, privacy, and trust in Microsoft 365
This MS-900 practice question tests your understanding of describe security, compliance, privacy, and trust in microsoft 365. 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 compliance officer needs to ensure that all user activities related to sensitive data in Microsoft 365 are recorded and available for forensic investigation. They require detailed logs of who accessed specific files in SharePoint Online, including attempts to access files that were blocked by DLP policies. Which solution should they enable?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Microsoft 365 Audit Log
Microsoft 365 Audit Log (Unified Audit Log) is the correct solution because it captures detailed records of user activities, including file access in SharePoint Online and blocked DLP policy actions. These logs are retained for forensic investigation and can be searched via the Microsoft 365 Purview compliance portal or accessed programmatically.
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.
✓
Microsoft 365 Audit Log
Why this is correct
The unified audit log records all user and admin actions, including SharePoint file accesses and DLP actions, meeting forensic requirements.
Related concept
Read the scenario before looking for a memorised answer.
✗
Microsoft Defender for Cloud Apps
Why it's wrong here
Defender for Cloud Apps provides visibility and control over app usage but does not log granular file-level access in SharePoint.
✗
Microsoft Purview Activity Explorer
Why it's wrong here
Activity Explorer focuses on DLP-related events, not all file access logs.
✗
Microsoft 365 Defender
Why it's wrong here
Microsoft 365 Defender is a suite of threat protection services, not a detailed audit logging solution.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse the real-time monitoring capabilities of Activity Explorer or Defender for Cloud Apps with the historical, searchable audit trail required for forensic investigation, mistakenly thinking those tools replace the Unified Audit Log.
Detailed technical explanation
How to think about this question
The Unified Audit Log ingests events from Exchange Online, SharePoint Online, OneDrive for Business, Azure AD, and other workloads via the Office 365 Management Activity API. Each event includes properties such as UserId, Operation, ObjectId, ClientIP, and ResultStatus (e.g., 'Blocked' for DLP actions). Audit records are retained for 90 days by default (or up to 10 years with appropriate licensing and retention policies), enabling long-term forensic analysis.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this MS-900 question in full detail.
Describe security, compliance, privacy, and trust in Microsoft 365 — This question tests Describe security, compliance, privacy, and trust in Microsoft 365 — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Microsoft 365 Audit Log — Microsoft 365 Audit Log (Unified Audit Log) is the correct solution because it captures detailed records of user activities, including file access in SharePoint Online and blocked DLP policy actions. These logs are retained for forensic investigation and can be searched via the Microsoft 365 Purview compliance portal or accessed programmatically.
What should I do if I get this MS-900 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.
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Question Discussion
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