Blue boxing was used in what type of attack?

A.
Data diddling

B.
Salami

C.
Phone fraud

D.
Masquerading

Explanation:
Blue boxing was the process of simulating a frequency tone, which
allowed attackers to gain free long distance phone service. This tone was
interpreted by the telephone company’s equipment as a valid command. Phreakers
developed or purchased devices that made this tone to obtain free long distance
calls.