This MS-900 practice question tests your understanding of describe microsoft 365 apps and services. 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 financial services firm must comply with regulatory requirements that prevent accidental sharing of sensitive customer data via email. They need to automatically detect and block emails containing credit card numbers sent to external recipients. Which Microsoft 365 service should they configure?
Microsoft Defender XDR
Why wrong: Defender XDR provides threat detection and response, not data loss prevention for emails.
Microsoft Purview
Purview includes DLP policies to detect and block sensitive data in emails.
Microsoft Intune
Why wrong: Intune manages devices and applications, not email DLP.
Microsoft Entra ID
Why wrong: Entra ID is identity and access management, not data protection.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Microsoft Purview
Microsoft Purview (formerly Microsoft 365 Compliance) includes Data Loss Prevention (DLP) policies that can automatically detect sensitive data types, such as credit card numbers, in emails and block them from being sent to external recipients. This directly addresses the regulatory requirement to prevent accidental sharing of sensitive customer data via email.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Microsoft Defender XDR
Why it's wrong here
Defender XDR provides threat detection and response, not data loss prevention for emails.
Microsoft Purview
Why this is correct
Purview includes DLP policies to detect and block sensitive data in emails.
Related concept
Read the scenario before looking for a memorised answer.
Microsoft Intune
Why it's wrong here
Intune manages devices and applications, not email DLP.
Microsoft Entra ID
Why it's wrong here
Entra ID is identity and access management, not data protection.
Common exam traps
The trap here is that candidates often confuse Microsoft Defender XDR (security threat detection) with Microsoft Purview (compliance and data protection), leading them to choose Defender for a data loss prevention scenario instead of the correct compliance service.
Detailed technical explanation
Microsoft Purview DLP uses deep content analysis via the Sensitive Information Type (SIT) engine, which can detect credit card numbers using pattern matching, checksum validation (Luhn algorithm), and keyword proximity. The DLP policy can be configured with 'Block' actions that prevent delivery of the email and optionally send a notification to the sender or a compliance officer. In a real-world scenario, a financial firm might also enable 'Policy Tips' to educate users before they attempt to send sensitive data, reducing false positives and user friction.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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.
What to study next
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FAQ
Describe Microsoft 365 apps and services — This question tests Describe Microsoft 365 apps and services — Read the scenario before looking for a memorised answer..
The correct answer is: Microsoft Purview — Microsoft Purview (formerly Microsoft 365 Compliance) includes Data Loss Prevention (DLP) policies that can automatically detect sensitive data types, such as credit card numbers, in emails and block them from being sent to external recipients. This directly addresses the regulatory requirement to prevent accidental sharing of sensitive customer data via email.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
This MS-900 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 MS-900 exam.
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