The answer is during the build phase after code commit. Static application security testing (SAST) is introduced here because it analyzes source code without executing it, allowing developers to catch vulnerabilities like injection flaws or buffer overflows immediately after the commit, before the code moves further down the pipeline. This minimizes rework by fixing issues when they are cheapest and fastest to resolve, rather than after deployment when remediation costs spike. On the CompTIA SecurityX CAS-004 exam, this tests your understanding of shift-left security principles and the correct placement of SAST versus DAST; a common trap is confusing SAST with dynamic testing or placing it in the production phase. Remember the mnemonic "SAST Stops Sloppy Stuff Sooner" to recall that SAST belongs early in the build, not during runtime or deployment.
CAS-004 Security Architecture Practice Question
This CAS-004 practice question tests your understanding of security architecture. 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.
An enterprise is adopting a DevOps model and wants to integrate security into the CI/CD pipeline. The security architect recommends adding automated security testing. Which phase of the pipeline should static application security testing (SAST) be introduced to minimize rework?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
During the build phase after code commit
SAST is most effective when run early, ideally during the build phase, so developers can fix vulnerabilities before deployment. In production, it's too late. During deployment might cause delays. SAST is not typically run on running applications.
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.
✓
During the build phase after code commit
Why this is correct
SAST analyzes source code, so running it in the build phase catches issues early.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
During the production deployment phase
Why it's wrong here
At deployment, vulnerabilities have already been integrated; rework is costly.
✗
After the code is promoted to production
Why it's wrong here
Post-production is too late; vulnerabilities are already exposed.
✗
During runtime in the staging environment
Why it's wrong here
SAST is static analysis, not runtime; DAST would be more appropriate for staging.
Common exam traps
Common exam trap: answer the scenario, not the keyword
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
How to think about this question
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.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 practitioner preparing for the CAS-004 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which CAS-004 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.
Security Architecture — This question tests Security Architecture — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: During the build phase after code commit — SAST is most effective when run early, ideally during the build phase, so developers can fix vulnerabilities before deployment. In production, it's too late. During deployment might cause delays. SAST is not typically run on running applications.
What should I do if I get this CAS-004 question wrong?
Identify which CAS-004 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.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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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