SQL injection attacks are becoming significantly more popular amongst hackers and there has been an estimated 69 percent increase of this attack type.

This exploit is used to great effect by the hacking community since it is the primary way to steal sensitive data from web applications. It takes advantage of non-validated input vulnerabilities to pass SQL commands through a web application for execution by a back-end database.

The below diagram shows how attackers launched SQL injection attacks on web applications.

Which of the following can the attacker use to launch an SQL injection attack?