Quick Answer
The answer is a regular expression. This is the correct rule pack element because a custom sensitive information type regex pattern is precisely what Microsoft Purview uses to define structured data formats like 'EMP-XXXXX', where a sequence of digits must follow a fixed prefix. In the SC-900 exam, this concept tests your understanding of how classification rules are built—specifically that regex handles variable-length or patterned data, while keyword lists only match exact words, functions rely on prebuilt logic, and data store references point to external sources. A common trap is confusing regex with a keyword list; remember that any pattern involving variable characters (like digits or dashes) requires a regular expression, not a static word. For a quick memory tip, think “regex for patterns, keywords for exact matches”—if the data has a structure, regex is your tool.
This SC-900 practice question tests your understanding of describe the concepts of security, compliance, and identity. 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.
Your organization uses Microsoft Purview to classify sensitive data. You need to create a custom sensitive information type that detects employee IDs matching the pattern 'EMP-XXXXX' (where X is a digit). Which rule pack element must you define?
Keyword list
Why wrong: Keyword lists are for exact words, not patterns.
Regular expression
A regex pattern can detect the 'EMP-XXXXX' pattern.
Data store reference
Why wrong: Data store references connect to external data sources.
Function
Why wrong: Functions are for built-in calculations like checksums.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Regular expression
Option D is correct because a regex pattern is used to define custom patterns in sensitive information types. Option A is incorrect because a keyword list is for exact keywords. Option B is incorrect because a function is for built-in functions. Option C is incorrect because a data store reference is for external data sources.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Keyword list
Why it's wrong here
Keyword lists are for exact words, not patterns.
Regular expression
Why this is correct
A regex pattern can detect the 'EMP-XXXXX' pattern.
Related concept
Static NAT maps one inside address to one outside address.
Data store reference
Why it's wrong here
Data store references connect to external data sources.
Function
Why it's wrong here
Functions are for built-in calculations like checksums.
Common exam traps
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Trap categories for this question
Keyword trap
Keyword lists are for exact words, not patterns.
Detailed technical explanation
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. 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
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SC-900 NAT questions on configuration and troubleshooting.
Describe the concepts of security, compliance, and identity — study guide chapter
Learn the concepts, then practise the questions
Describe the concepts of security, compliance, and identity practice questions
Targeted practice on this topic area only
All SC-900 questions
1,411 questions across all exam domains
Microsoft Security, Compliance, and Identity Fundamentals SC-900 study guide
Full concept coverage aligned to exam objectives
SC-900 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Practise SC-900 questions linked to Describe the capabilities of Microsoft Entra.
Practise SC-900 questions linked to Describe the capabilities of Microsoft security solutions.
Practise SC-900 questions linked to Describe the capabilities of Microsoft compliance solutions.
Practise SC-900 questions linked to Describe the concepts of security, compliance, and identity.
Practise SC-900 questions linked to SC-900 fundamentals.
Practise SC-900 questions linked to SC-900 scenario.
Practise SC-900 questions linked to SC-900 troubleshooting.
Practice this exam
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Describe the concepts of security, compliance, and identity — This question tests Describe the concepts of security, compliance, and identity — Static NAT maps one inside address to one outside address..
The correct answer is: Regular expression — Option D is correct because a regex pattern is used to define custom patterns in sensitive information types. Option A is incorrect because a keyword list is for exact keywords. Option B is incorrect because a function is for built-in functions. Option C is incorrect because a data store reference is for external data sources.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SC-900 NAT questions on configuration and troubleshooting.
Static NAT maps one inside address to one outside address.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: Jun 21, 2026
This SC-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 SC-900 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.