Penetration testing (also called pen testing) is the practice of testing a computer system, network, or Web application to find vulnerabilities that an attacker could exploit. Which of the following areas can be exploited in a penetration test? Each correct answer represents a complete solution. Choose all that apply.

A. Social engineering
B. File and directory permissions
C. Buffer overflows
D. Kernel flaws
E. Race conditions
F. Information system architectures
G. Trojan horses