Why can encryption be challenging to security monitoring?

Why can encryption be challenging to security monitoring?
A . Encryption introduces latency.
B . Encryption introduces additional processing requirements by the CP
D . Encryption can be used by threat actors as a method of evasion and obfuscation, and security monitoring tools might not be able to inspect encrypted traffic.
E . Encryption can be used by attackers to monitor VPN tunnels.

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Answer: C