Joel, a professional hacker, targeted a company and identified the types of websites frequently visited by its employees

[answerhappygod]

Joel, a professional hacker, targeted a company and identified the types of websites frequently visited by its employees. Using this information, he searched for possible loopholes in these websites and injected a malicious script that can redirect users from the web page and download malware onto a victim's machine. Joel waits for the victim to access the infected web application so as to compromise the victim's machine.
Which of the following techniques is used by Joel in the above scenario?

A. Watering hole attack
B. DNS rebinding attack
C. MarioNet attack
D. Clickjacking attack