Which of the following is a vulnerability associated with disabling pop-up blockers?

A.
An alert message from the administrator may not be visible

B.
A form submitted by the user may not open

C.
The help window may not be displayed

D.
Another browser instance may execute malicious code

Explanation:
Pop-up blockers prevent websites from opening new browser windows without the
users consent. These are often used for advertisements but can also be used to distribute
malicious code.