Which of the following is a description of the principle on which a Denial of Service (DoS) attack works?

A.
MS-DOS and PC-DOS operating systems using a weak security protocol.

B.
Overloaded buffer systems can easily address error conditions and respond appropriately.

C.
Host systems are incapable of responding to real traffic, if they have an overwhelming number of incomplete connections (SYN/RCVD State).

D.
All CLIENT systems have TCP/IP stack compromisable implementation weaknesses and permit them to launch an attack easily.