Question 890 of 217
Describe security, compliance, privacy, and trust in Microsoft 365 →mediumMultiple ChoiceObjective-mapped
MS-900 Practice Question: Describe security, compliance, privacy, and trust in Microsoft 365
A compliance administrator needs to automatically detect when employees share documents containing a customer's credit card number via email and block such sharing before the email is sent. Which Microsoft Purview solution should they configure?
⚠ Common exam trap
Test-takers frequently confuse Information Rights Management (IRM) with DLP because both involve protecting sensitive data, but IRM controls access after sending while DLP prevents the send action itself.
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
✓
Data Loss Prevention (DLP)
Data Loss Prevention (DLP) is the correct solution because it is specifically designed to automatically detect sensitive data, such as credit card numbers, in transit (e.g., email) and enforce policy actions like blocking the email before it is sent. DLP uses deep content analysis, including pattern matching against predefined sensitive information types (e.g., credit card number regex), to inspect email bodies and attachments in real time within Exchange Online.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Data Loss Prevention (DLP)
Why this is correct
Data Loss Prevention (DLP) policies in Microsoft 365 compliance automatically scan outbound email messages and attachments for sensitive information types, such as credit card numbers, and can block the message at the transport layer. A DLP rule can trigger a block action, preventing the sender from delivering the message, and even include a policy tip to notify the user. This is the only option here that directly inspects message content for defined sensitive patterns and enforces an outbound send block.
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Information Rights Management (IRM)
Why it's wrong here
Information Rights Management (IRM) is a rights-management technology that applies usage restrictions to protected content, such as preventing forwarding, printing, or copying after the message is received. IRM does not scan the body or attachments of unencrypted outbound messages for sensitive data patterns like credit card numbers. Its enforcement occurs after delivery or when the receiver opens the protected item, so it cannot automatically block a message before it is sent.
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Sensitivity labels
Why it's wrong here
Sensitivity labels are classification metadata that mark the confidentiality level of content and can optionally apply encryption or visual markings. They do not themselves act as an enforcement point in the email transport pipeline; a label must be referenced by another policy, such as a DLP rule, to trigger an action like blocking an outbound message. Therefore, enabling sensitivity labels alone would not detect credit card numbers or block email transmission.
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Microsoft Defender for Office 365 (ATP)
Why it's wrong here
Microsoft Defender for Office 365 (formerly ATP) is a security service focused on threat protection against malicious links, phishing attachments, URLs, and impersonation attacks. It uses Safe Attachments and Safe Links to scan for malware and phishing indicators, not for compliance-sensitive data such as credit card numbers. Since its detection engine is geared toward security threats, it cannot inspect message content for data classification and block based on sensitive information patterns.
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Last reviewed: Jun 11, 2026
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