Which of the following types of firewalls can protect against SQL injection attacks?

Firewalls are the software or hardware systems that are able to control and monitor the traffic coming in and out the target network based on pre-defined set of rules.

Which of the following types of firewalls can protect against SQL injection attacks?
A . Data-driven firewall
B . Stateful firewall
C . Packet firewall
D . Web application firewall

Answer: D