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. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 outgoing emails containing a customer's credit card number are automatically encrypted before delivery. External recipients must be able to reply with the same level of encryption without a separate signing-up process. Which Microsoft Purview solution should be configured?
Office 365 Message Encryption (OME) with a DLP policy
DLP policies can detect credit card numbers and trigger OME encryption automatically. OME allows external recipients to reply encrypted via a secure portal.
B
Sensitivity labels with automatic marking
Why wrong: Sensitivity labels can be auto-applied to emails based on content, but the primary mechanism for automatic email encryption is OME with DLP.
C
Azure Information Protection (AIP)
Why wrong: AIP is the underlying classification engine but the recommended approach for email encryption uses OME and DLP policies.
D
Microsoft Defender for Office 365
Why wrong: Defender for Office 365 protects against threats like phishing and malware, but does not provide native email encryption capabilities.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Office 365 Message Encryption (OME) with a DLP policy
Office 365 Message Encryption (OME) with a Data Loss Prevention (DLP) policy is the correct solution because OME provides automatic encryption for emails based on sensitive information types (e.g., credit card numbers) detected by DLP rules. It also supports the 'encrypt-only' option, which allows external recipients to reply with the same level of encryption without requiring a separate sign-up or certificate exchange, leveraging the Microsoft 365 message encryption infrastructure.
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.
✓
Office 365 Message Encryption (OME) with a DLP policy
Why this is correct
DLP policies can detect credit card numbers and trigger OME encryption automatically. OME allows external recipients to reply encrypted via a secure portal.
Related concept
Read the scenario before looking for a memorised answer.
✗
Sensitivity labels with automatic marking
Why it's wrong here
Sensitivity labels can be auto-applied to emails based on content, but the primary mechanism for automatic email encryption is OME with DLP.
✗
Azure Information Protection (AIP)
Why it's wrong here
AIP is the underlying classification engine but the recommended approach for email encryption uses OME and DLP policies.
✗
Microsoft Defender for Office 365
Why it's wrong here
Defender for Office 365 protects against threats like phishing and malware, but does not provide native email encryption capabilities.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse sensitivity labels (Option B) with DLP-based encryption, not realizing that sensitivity labels require explicit configuration for automatic encryption and do not inherently handle reply encryption without additional setup, whereas OME with DLP provides the seamless, policy-driven encryption and reply capability described.
Detailed technical explanation
How to think about this question
OME uses Azure Rights Management (Azure RMS) to encrypt messages, and when combined with a DLP policy, it inspects email content for sensitive data types (e.g., credit card numbers matching the regex pattern defined in Microsoft 365) and applies the 'Encrypt-Only' template. This template allows recipients to reply with the same encryption level because the reply is automatically encrypted using the same OME portal, which does not require the recipient to have a Microsoft 365 subscription or install any software—just a web browser or supported email client.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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: Office 365 Message Encryption (OME) with a DLP policy — Office 365 Message Encryption (OME) with a Data Loss Prevention (DLP) policy is the correct solution because OME provides automatic encryption for emails based on sensitive information types (e.g., credit card numbers) detected by DLP rules. It also supports the 'encrypt-only' option, which allows external recipients to reply with the same level of encryption without requiring a separate sign-up or certificate exchange, leveraging the Microsoft 365 message encryption infrastructure.
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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