What is War Dialing?

What is War Dialing?
A . War dialing involves the use of a program in conjunction with a modem to penetrate the modem/PBX-based systems
B . War dialing is a vulnerability scanning technique that penetrates Firewalls
C . It is a social engineering technique that uses Phone calls to trick victims
D . Involves IDS Scanning Fragments to bypass Internet filters and stateful Firewalls

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Answer: A