- A
Configure a branch policy to require at least two reviewers on pull requests to the main branch.
Why wrong: Reviewers may not catch secrets; automated scanning is needed.
- B
Implement a manual approval gate on the Release stage to review each deployment for secrets.
Why wrong: Manual review is slow and error-prone; automation is required.
- C
Use a pipeline decorator to inject a validation step that runs Azure Policy on the code repository.
Why wrong: Azure Policy applies to Azure resources, not code content.
- D
Add a 'Credential Scanner' task to the Build pipeline and configure it to fail the build if any secrets are found. Also, move all secrets to Azure Key Vault and reference them via variable groups.
Automated secret scanning prevents secrets from being merged, and Key Vault centralizes secret management.
AZ-400 Develop a security and compliance plan Practice Question
This AZ-400 practice question tests your understanding of develop a security and compliance plan. 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.
Your organization uses Azure DevOps for a multi-tier web application. The application consists of a React frontend, a Node.js API, and a SQL database. The security team has mandated the following: (1) All code changes must be scanned for secrets before merging to the main branch. (2) Infrastructure-as-code templates (ARM) must be validated for security compliance before deployment. (3) Production deployments must use a service connection with a managed identity that has only the required permissions. You have set up a CI/CD pipeline with two stages: Build and Release. The Build stage runs on pull requests and the Release stage deploys to a production environment. Recently, a developer accidentally committed a secret (API key) to a configuration file. The secret was not caught by the pipeline, and the code was merged to main. You need to prevent this in the future. What should you do?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Add a 'Credential Scanner' task to the Build pipeline and configure it to fail the build if any secrets are found. Also, move all secrets to Azure Key Vault and reference them via variable groups.
Option D is correct because it directly addresses the root cause: secrets were not being scanned before merge. The Credential Scanner task (part of Microsoft Security Code Analysis) scans for hardcoded secrets and can fail the build, preventing the merge. Moving secrets to Azure Key Vault and referencing them via variable groups (linked to the vault) ensures secrets are never stored in the repository, eliminating the risk of accidental commits.
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.
- ✗
Configure a branch policy to require at least two reviewers on pull requests to the main branch.
Why it's wrong here
Reviewers may not catch secrets; automated scanning is needed.
- ✗
Implement a manual approval gate on the Release stage to review each deployment for secrets.
Why it's wrong here
Manual review is slow and error-prone; automation is required.
- ✗
Use a pipeline decorator to inject a validation step that runs Azure Policy on the code repository.
Why it's wrong here
Azure Policy applies to Azure resources, not code content.
- ✓
Add a 'Credential Scanner' task to the Build pipeline and configure it to fail the build if any secrets are found. Also, move all secrets to Azure Key Vault and reference them via variable groups.
Why this is correct
Automated secret scanning prevents secrets from being merged, and Key Vault centralizes secret management.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse Azure Policy (which governs Azure resource compliance) with code scanning tools, or mistakenly think that manual reviews or approval gates are sufficient to catch secrets before merge, when automated scanning is required by the mandate.
Detailed technical explanation
How to think about this question
The Credential Scanner (CredScan) uses pattern matching and heuristic analysis to detect high-entropy strings, known secret patterns (e.g., API keys, connection strings), and common credential formats. It integrates with Azure DevOps as a build task and can be configured with a severity threshold to fail the pipeline. Azure Key Vault variable groups in Azure Pipelines use a service principal or managed identity to securely fetch secrets at runtime, ensuring secrets are never exposed in logs or YAML files.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
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FAQ
Questions learners often ask
What does this AZ-400 question test?
Develop a security and compliance plan — This question tests Develop a security and compliance plan — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Add a 'Credential Scanner' task to the Build pipeline and configure it to fail the build if any secrets are found. Also, move all secrets to Azure Key Vault and reference them via variable groups. — Option D is correct because it directly addresses the root cause: secrets were not being scanned before merge. The Credential Scanner task (part of Microsoft Security Code Analysis) scans for hardcoded secrets and can fail the build, preventing the merge. Moving secrets to Azure Key Vault and referencing them via variable groups (linked to the vault) ensures secrets are never stored in the repository, eliminating the risk of accidental commits.
What should I do if I get this AZ-400 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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Last reviewed: Jun 11, 2026
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