A common concern with poorly written web applications is that they can allow an attacker to: 

Answer options:

A. gain control through a buffer overflow.
B. conduct a distributed denial of service (DoS) attack.
C. abuse a race condition.
D. inject structured query language (SQL) statements.

D

Structured query language (SQL) injection is one of the most common and dangerous web application vulnerabilities. Buffer overflows and race conditions are very difficult to find and exploit on web applications. Distributed denial of service (DoS) attacks have nothing to do with the quality of a web application.