The answer is static application security testing (SAST) integrated into the IDE and regular code reviews. These two practices are most effective for early vulnerability identification because they analyze source code or design before the application is compiled or run, catching flaws like injection points and insecure logic at the moment of writing. On the CompTIA SecurityX CAS-004 exam, this question tests your understanding of secure SDLC phases, specifically that SAST and code reviews are shift-left techniques applied during development, while DAST and penetration testing occur later against running systems. A common trap is confusing SAST with DAST, but remember: SAST is static (source code), DAST is dynamic (running app). For a quick memory tip, think “SAST and Review catch bugs before they brew.”
CAS-004 Practice Question: Application Environment, Configuration and Security
This CAS-004 practice question tests your understanding of application environment, configuration and security. 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 is adopting a secure software development lifecycle (SDLC). Which two practices are most effective for identifying vulnerabilities early in the development process? (Select TWO.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Regular code reviews with security focus
Options B (SAST integrated into IDE) and D (Regular code reviews) are correct because they find vulnerabilities during development. Option A (DAST) is performed on running applications later. Option C (Penetration testing) is after deployment. Option E (RASP) is runtime protection.
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.
✗
Runtime application self-protection (RASP)
Why it's wrong here
RASP protects at runtime, not during development.
✗
Dynamic application security testing (DAST)
Why it's wrong here
DAST tests running applications, typically later in SDLC.
✓
Regular code reviews with security focus
Why this is correct
Code reviews can find logic flaws and security issues before build.
Related concept
Read the scenario before looking for a memorised answer.
✓
Static application security testing (SAST) integrated into the IDE
Why this is correct
SAST scans source code during development, catching issues early.
Related concept
Read the scenario before looking for a memorised answer.
✗
Penetration testing after deployment
Why it's wrong here
Penetration testing occurs late, after code is written.
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.
Application Environment, Configuration and Security — This question tests Application Environment, Configuration and Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Regular code reviews with security focus — Options B (SAST integrated into IDE) and D (Regular code reviews) are correct because they find vulnerabilities during development. Option A (DAST) is performed on running applications later. Option C (Penetration testing) is after deployment. Option E (RASP) is runtime protection.
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.
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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