Users of Instant Messaging clients are especially prone to what?

A.
Theft of root user credentials.

B.
Disconnection from the file server.

C.
Hostile code delivered by file transfer.

D.
Slow Internet connections.

E.
Loss of email privileges.

F.
Blue Screen of Death errors.

Explanation:
IM clients can also be compromised by malicious code, Trojan Horse programs, and traditional DOS attacks.
Reference: Security + (SYBEX) page 197