MS-900 Describe Microsoft 365 pricing and support Practice Question
This MS-900 practice question tests your understanding of describe microsoft 365 pricing 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 company with 300 users currently has Microsoft 365 Business Premium licenses. They want to add the highest level of automated threat investigation and response capabilities for all users. Which licensing option should they purchase?
Why wrong: This would provide the needed capabilities but at a much higher cost per user than simply adding a plan add-on.
B
Add the Microsoft 365 E5 Security add-on for each user
Why wrong: This add-on is designed for Microsoft 365 E3/E5 users, not for Business Premium plans.
C
Add the Microsoft 365 Defender for Office 365 Plan 2 add-on for each user
This add-on directly upgrades the existing Defender for Office 365 Plan 1 included in Business Premium to Plan 2, providing advanced investigation and response.
D
Add the Microsoft 365 Business Premium Threat Protection add-on
Why wrong: There is no such add-on available for Business Premium plans.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Add the Microsoft 365 Defender for Office 365 Plan 2 add-on for each user
Microsoft 365 Defender for Office 365 Plan 2 provides the highest level of automated investigation and response (AIR) capabilities, including threat hunting, automated remediation, and simulation training. Since the company already has Microsoft 365 Business Premium, which includes Defender for Office 365 Plan 1, adding Plan 2 as an add-on is the most cost-effective way to achieve the desired capabilities without upgrading to E5.
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.
✗
Upgrade all users to Microsoft 365 E5
Why it's wrong here
This would provide the needed capabilities but at a much higher cost per user than simply adding a plan add-on.
✗
Add the Microsoft 365 E5 Security add-on for each user
Why it's wrong here
This add-on is designed for Microsoft 365 E3/E5 users, not for Business Premium plans.
✓
Add the Microsoft 365 Defender for Office 365 Plan 2 add-on for each user
Why this is correct
This add-on directly upgrades the existing Defender for Office 365 Plan 1 included in Business Premium to Plan 2, providing advanced investigation and response.
Related concept
Read the scenario before looking for a memorised answer.
✗
Add the Microsoft 365 Business Premium Threat Protection add-on
Why it's wrong here
There is no such add-on available for Business Premium plans.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the Microsoft 365 E5 Security add-on (Option B) with the more targeted Defender for Office 365 Plan 2 add-on, not realizing that the E5 Security add-on includes additional, unnecessary features and costs more, while the question specifically asks for the highest level of automated threat investigation and response for all users, which is exactly what Defender for Office 365 Plan 2 provides.
Detailed technical explanation
How to think about this question
Defender for Office 365 Plan 2 includes automated investigation and response (AIR) playbooks that use machine learning to triage and remediate threats like phishing, malware, and business email compromise (BEC). Under the hood, AIR leverages the Microsoft Graph Security API to correlate signals from Exchange Online Protection (EOP) and Defender for Office 365 Plan 1, then executes automated actions such as soft-deleting malicious emails, blocking URLs at time of click, and isolating compromised user accounts. In a real-world scenario, if a user receives a spear-phishing email with a malicious attachment, Plan 2 can automatically investigate the email, identify all recipients, and remove the threat across the tenant without manual intervention.
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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
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 and support — This question tests Describe Microsoft 365 pricing and support — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Add the Microsoft 365 Defender for Office 365 Plan 2 add-on for each user — Microsoft 365 Defender for Office 365 Plan 2 provides the highest level of automated investigation and response (AIR) capabilities, including threat hunting, automated remediation, and simulation training. Since the company already has Microsoft 365 Business Premium, which includes Defender for Office 365 Plan 1, adding Plan 2 as an add-on is the most cost-effective way to achieve the desired capabilities without upgrading to E5.
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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