MS-900 Practice Question: Describe Microsoft 365 pricing, licensing, and support
This MS-900 practice question tests your understanding of describe microsoft 365 pricing, licensing, and support. 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.
A customer has 100 users on Microsoft 365 Business Basic and wants to add Microsoft Defender for Office 365 Plan 1. Which licensing approach should they use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Purchase Microsoft Defender for Office 365 Plan 1 as an add-on for each user
Microsoft Defender for Office 365 Plan 1 is an add-on that can be purchased for users who already have a qualifying subscription like Microsoft 365 Business Basic. It provides advanced threat protection features such as Safe Attachments and Safe Links, and it must be assigned per user on top of an existing Microsoft 365 license. Option C is correct because it directly describes this additive licensing model.
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.
✗
Purchase a separate Microsoft Defender for Office 365 Plan 1 subscription without underlying Microsoft 365 licenses
Why it's wrong here
Defender for Office 365 requires an underlying Microsoft 365 license.
✗
Upgrade all users to Microsoft 365 E3
Why it's wrong here
E3 includes Defender for Office 365 Plan 1 but also includes Windows and Enterprise Mobility, which may not be needed.
✓
Purchase Microsoft Defender for Office 365 Plan 1 as an add-on for each user
Why this is correct
Defender for Office 365 Plan 1 is an add-on to Microsoft 365 Business Basic.
Related concept
Read the scenario before looking for a memorised answer.
✗
Upgrade to Microsoft 365 E5
Why it's wrong here
E5 includes Defender for Office 365 Plan 2, which is more expensive than needed.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume Defender for Office 365 Plan 1 is a standalone product or that it is included in E3, when in fact it is an add-on that requires a qualifying base license and is not bundled with E3.
Detailed technical explanation
How to think about this question
Microsoft Defender for Office 365 Plan 1 operates by scanning email attachments and URLs in real time using detonation chambers and heuristic analysis, and it integrates directly with Exchange Online Protection (EOP). The licensing model requires each user to have both a base subscription (e.g., Business Basic, which includes EOP) and the Defender add-on license assigned in the Microsoft 365 admin center. In a real-world scenario, a customer with 100 Business Basic users could purchase 100 Defender for Office 365 Plan 1 add-on licenses and assign them to the same users, enabling advanced protection without changing their existing productivity suite.
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 Microsoft 365 pricing, licensing, and support — This question tests Describe Microsoft 365 pricing, licensing, and support — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Purchase Microsoft Defender for Office 365 Plan 1 as an add-on for each user — Microsoft Defender for Office 365 Plan 1 is an add-on that can be purchased for users who already have a qualifying subscription like Microsoft 365 Business Basic. It provides advanced threat protection features such as Safe Attachments and Safe Links, and it must be assigned per user on top of an existing Microsoft 365 license. Option C is correct because it directly describes this additive licensing model.
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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