Quick Answer
The answer is the make_set() function, because it creates an array of unique values from a specified expression, making it ideal for aggregating distinct alert titles across multiple sources during a KQL alert correlation. In a ransomware incident, where alerts from Defender for Endpoint, Office 365, and Identity are logged in a single table, make_set() allows you to collect all unique alert names into one field per incident, enabling you to spot the initial entry point by comparing the array of correlated alerts. On the SC-200 exam, this tests your ability to choose the right aggregation function for incident enrichment, not for expanding or merging tables—a common trap is confusing make_set() with mv-expand (which does the opposite) or union (which combines rows from different tables). Remember the memory tip: “make_set() makes a set of unique items,” so think of it as collecting distinct puzzle pieces from one table to see the full attack picture.
This SC-200 practice question tests your understanding of respond to security incidents. 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.
You are investigating a ransomware incident in Microsoft Sentinel. The incident contains multiple alerts from Microsoft Defender for Endpoint, Microsoft Defender for Office 365, and Microsoft Defender for Identity. You need to correlate the alerts and identify the initial entry point. Which KQL function should you use to combine the alerts?
materialize()
Why wrong: materialize is used to cache results for faster performance, not for combining alerts.
union
Why wrong: union combines multiple tables, not useful for correlating alerts within the same table.
mv-expand
Why wrong: mv-expand expands multi-value columns, not for aggregating alerts.
make_set()
make_set() creates an array of unique values, ideal for aggregating alert titles for correlation.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
make_set()
Option D is correct because the make_set function creates an array of unique values from an expression, which is useful for aggregating alert titles. Option A is wrong because materialize is for caching query results. Option B is wrong because the mv-expand operator expands multi-value arrays. Option C is wrong because the union operator combines tables, not useful for correlating within a single table.
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.
materialize()
Why it's wrong here
materialize is used to cache results for faster performance, not for combining alerts.
union
Why it's wrong here
union combines multiple tables, not useful for correlating alerts within the same table.
mv-expand
Why it's wrong here
mv-expand expands multi-value columns, not for aggregating alerts.
make_set()
Why this is correct
make_set() creates an array of unique values, ideal for aggregating alert titles for correlation.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Identify which SC-200 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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FAQ
Respond to security incidents — This question tests Respond to security incidents — Read the scenario before looking for a memorised answer..
The correct answer is: make_set() — Option D is correct because the make_set function creates an array of unique values from an expression, which is useful for aggregating alert titles. Option A is wrong because materialize is for caching query results. Option B is wrong because the mv-expand operator expands multi-value arrays. Option C is wrong because the union operator combines tables, not useful for correlating within a single table.
Identify which SC-200 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 21, 2026
This SC-200 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 SC-200 exam.
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