Eavesdropping is a () attack in which an attacker () inserts his own system between a sending station and a receiving station. Interception is a () attack in which an attacker () inserts his own system between a sending station and an accepting station.

Eavesdropping is a () attack in which an attacker () inserts his own system between a sending station and a receiving station. Interception is a () attack in which an attacker () inserts his own system between a sending station and an accepting station.
A . Passive, unnecessary, active, must
B . Active, must, passive, unnecessary
C . Active, unnecessary, passive, must
D . Passive, must, active, unnecessary

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Answer: A