Firewall Software Has Become an Essential Computer System Component for Individuals

Multiple Choice

Firewall software has become an essential computer system component for individuals connecting to the Internet with DSL or cable modems because:

A) Their "always-on" connection status makes them particularly vulnerable.
B) Crackers dislike DSL connections for using too much band-width on the Internet.
C) DSL will not operate without a firewall.
D) Firewalls are the only security that works with cable modems.