Pop-up and pop-under windows were once considered a valid advertising method for some Web designers. Most designers now consider this advertising method invalid because users tend to find pop-ups and pop-unders annoying. Which of the following is another common reason to avoid pop-ups and pop-unders?

A.
Pop-ups are a single browser technology.

B.
Many browsers now feature pop-up blockers.

C.
Pop-ups are considered an invasion of privacy.

D.
The HTML code is no longer supported.