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