Which of the following types of attacks cannot be prevented by a firewall?
Each correct answer represents a complete solution. Choose all that apply.

A.
Shoulder surfing attack

B.
Ping flood attack

C.
URL obfuscation attack

D.
Phishing attack

Explanation:
URL obfuscation attacks, phishing attacks, and shoulder surfing attacks are examples of social engineering attacks. Since these attacks occur as a result of man-made mistakes, they cannot be prevented with the help of any firewall.