Refer to the exhibit
A service provider has a requirement to use Ethernet OAM to detect end-to-end connectivity failures between SP-SW1 and SP- SW2.
Which two ways to design this solution are true? (Choose two)
A . Enable unicast heartbeat messages to be periodically exchanged between MEPs
B . Enable Connectivity Fault Management on the SP switches
C . Use upward maintenance endpoints on the SP switches
D . Forward E-LMI PDUs over VPLS
E . Forward LLD PDUs over the VPLS
Answer: B,C