Assuming all of the following features are supported in a hardware-assisted manner, which of the following will have the most detrimental impact on the delay of the packet?

You are tasked with implementing a 1000-phone remote access solution, where phones will traverse a WAN edge router.

Assuming all of the following features are supported in a hardware-assisted manner, which of the following will have the most detrimental impact on the delay of the packet?
A . encryption
B . stateful firewall
C . MPLS encapsulation
D . GRE encapsulation

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Answer: A