Which of the following statements regarding remote access protocols is TRUE?

A.
SLIP provides no error checking and packet addressing but can be used over point-to-point
links.

B.
Networks that use PPTP are vulnerable to attack from users on the Internet because PPTP
uses the Internet as a WAN link.

C.
Like SLIP, PPP provides no error checking but is easy to configure.

D.
PPP supports authentication negotiation, as well as negotiation of encryption and compression
between client and server.