Which one of the following is an example of electronic piggybacking?

Which one of the following is an example of electronic piggybacking?

A.
Attaching to a communications line and substituting data.

B.
Abruptly terminating a dial-up or direct-connect session.

C.
Following an authorized user into the computer room.

D.
Recording and playing back computer transactions.

Explanation:
Ok this is a weird little question. The term electronic is kinda of throwing me a bit. A
lot of times piggybacking can be used in terms of following someone in a building.
Piggyback – Gaining unauthorized access to a system via another user’s legitimate connection.
(see between-the-lines entry)
Between-the-lines entry 0 Unauthorized access obtained by tapping the temporarily inactive
terminal of a legitimate user. -Ronald Krutz The CISSP PREP Guide (gold edition) pg 914, 885