Why would the network manager elect to implement a configuration that includes GRE tunnels for a eleworker deployment?（）

• A、GRE can use transport mode and save up to twenty bytes per packet.
• B、The corporate network includes many discontinuous blocks of IP networks and requires split tunneling.
• C、The corporation's primary application is based on IP multicast.
• D、Without GRE, there is no means to detect a head-end failure.
• E、GRE would enable path MTU discovery.