Bob says that he never uses any environment variable in his code, so he does not need to worry about any security problem caused by environment variables. Is he correct?

A) Yes, he is correct. Environment variables do not pose security risks.
B) No, he is incorrect. Even if he doesn't directly use them, environment variables can still pose security risks if they are improperly handled or exploited.
C) Yes, he is correct. Environment variables are always secure and cannot cause any security problems.
D) No, he is incorrect. Environment variables are often targeted by attackers and can introduce security vulnerabilities if not properly managed.