Secure coding training focused on OWASP principlesis the most comprehensive long-term solution to address the root cause of XSS vulnerabilities by ensuring developers understand how to write secure code, including proper encoding and input validation.
Option A (Static analysis): This helps identify vulnerabilities in code but does not address the root cause.
Option B (Secure library): While useful, it does not tackle inconsistent secure coding practices across the team.
Option C (API management): This is more relevant for API-related security but does not resolve broader XSS issues.
Option D (DAST tool): Dynamic testing identifies issues in runtime but does not prevent them in development.
References:
CompTIA CASP+ Exam Objective 4.1: Analyze application vulnerabilities and implement secure coding best practices.
CASP+ Study Guide, 5th Edition, Chapter 8, Secure Application Development.