Yvonne has received reports that the Web server she administers has been responding slowly to page requests, and often responds so slowly that requested pages are never received. After reviewing the server logs, Yvonne determines that the Web server has received more than 1 billion requests sent to a nonexistent port. The Web server is the target of:

A.
buffer overflow attacks.

B.
denial-of-service attacks.

C.
pharming attacks.

D.
database tampering.