Why are encryption and protocol tunneling effective techniques for IPS evasion attacks?

Why are encryption and protocol tunneling effective techniques for IPS evasion attacks?
A . Encrypted packets bypass IPS sensors, as IP and TCP header information is unreadable by the sensor.
B . Tunneling protocols send packets end-to-end and therefore cannot transit the IPS sensor.
C . IPS sensors cannot unencrypt the payload to determine the contents of the data.
D . Packets bypass the IPS sensor after its memory resources are exhausted unencrypting packets.

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Answer: C