Why would the network manager elect to implement a configuration that includes GRE tunnels for a eleworker deployment?（）
- AGRE can use transport mode and save up to twenty bytes per packet.
- BThe corporate network includes many discontinuous blocks of IP networks and requires split tunneling.
- CThe corporation's primary application is based on IP multicast.
- DWithout GRE, there is no means to detect a head-end failure.
- EGRE would enable path MTU discovery.