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

Answer: A

Explanation: