Static code analysis is the most appropriate choice for examining the codebase for security vulnerabilities without executing the program. This analysis is often automated and can detect a range of issues, including syntax errors, potential bugs, and common security vulnerabilities.

Dynamic code analysis would not be the best option, as it involves testing and evaluating a program while it is running, which was not part of the criteria specified in the question. Manual code review, while helpful, may not be as comprehensive as static code analysis for large codebases due to human error and limitations in examining every aspect of the code manually. Fuzzing is typically used to test a program by feeding it random data, which also falls under dynamic testing.