The answer is Microsoft Defender for Office 365 because it is the only Microsoft 365 security solution that includes automated investigation and response (AIR) capabilities specifically designed for email threats. This feature uses machine learning and automation to detect, investigate, and remediate sophisticated attacks like business email compromise (BEC) without requiring manual intervention, by analyzing email patterns, user behavior, and threat intelligence in real time. On the SC-900 exam, this question tests your understanding of how Microsoft’s security solutions map to specific threat domains—Defender for Office 365 handles email and collaboration threats, while Defender for Identity, Endpoint, and Cloud Apps cover identity, device, and app security respectively. A common trap is confusing Defender for Office 365 with Defender for Identity, which focuses on on-premises Active Directory risks, not email. Memory tip: think “Office 365 = Email AIR” to link the solution directly to automated email response.
SC-900 Practice Question: Describe the capabilities of Microsoft security solutions
This SC-900 practice question tests your understanding of describe the capabilities of microsoft security solutions. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Your organization's security team wants to automatically investigate and respond to sophisticated email threats like business email compromise (BEC) without manual intervention. Which Microsoft 365 security solution should you use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Microsoft Defender for Office 365
Option C is correct because Microsoft Defender for Office 365 includes automated investigation and response capabilities for email threats. Option A is wrong because Defender for Identity focuses on on-premises identity threats. Option B is wrong because Defender for Endpoint is for endpoint security. Option D is wrong because Defender for Cloud Apps is for cloud app security.
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 Defender for Cloud Apps
Why it's wrong here
Defender for Cloud Apps secures cloud applications, not email.
✗
Microsoft Defender for Endpoint
Why it's wrong here
Defender for Endpoint secures endpoints, not email.
✗
Microsoft Defender for Identity
Why it's wrong here
Defender for Identity protects on-premises Active Directory identities, not email threats.
✓
Microsoft Defender for Office 365
Why this is correct
Defender for Office 365 provides automated investigation and response for email threats like BEC.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
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
How to think about this question
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.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 SC-900 question in full detail.
Identify which SC-900 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.
Describe the capabilities of Microsoft security solutions — This question tests Describe the capabilities of Microsoft security solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Microsoft Defender for Office 365 — Option C is correct because Microsoft Defender for Office 365 includes automated investigation and response capabilities for email threats. Option A is wrong because Defender for Identity focuses on on-premises identity threats. Option B is wrong because Defender for Endpoint is for endpoint security. Option D is wrong because Defender for Cloud Apps is for cloud app security.
What should I do if I get this SC-900 question wrong?
Identify which SC-900 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.
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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