Static Application Security Testing (SAST) is the best method for validating code as it is written. SAST analyzes the source code or binaries of an application for vulnerabilities before the code is executed, allowing developers to identify and fix security flaws early in the development process. This method integrates into the development environment and provides real-time feedback, which is critical for ensuring secure coding practices from the start. CASP+ highlights the importance of SAST in secure software development lifecycles (SDLCs) as a proactive measure to prevent security issues before the code is deployed. References: * CASP+ CAS-004 Exam Objectives: Domain 2.0 - Enterprise Security Operations (SAST for Secure Code Validation) * CompTIA CASP+ Study Guide: Secure Software Development and Static Code Analysis