Which solution can be used to improve network efficiency over PPPoE, IPsec and GRE networks?

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Your company utilizes many types of network transports, and you want to increase the efficiency of the network.

Which solution can be used to improve network efficiency over PPPoE, IPsec and GRE networks?
A . OTAM
B . IRDP
C . Host Discovery Protocol
D . PMTUD

Answer: D