Which of the following is the oldest phone hacking method used by hackers to make free calls?

Which of the following is the oldest phone hacking method used by hackers to make free calls?

Q. Which of the following is the oldest phone hacking method used by hackers to make free calls?

A.            Clickjacking

B.            DMOS

C.            Cracking

D.            Phreaking

Answer: Phreaking

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