Which Layer 2 services should be considered to address this design feature?

A Mobile Service Provider would like to design and deploy an Ethernet service which has similar physical link failover/failback characteristics on the active/backup links as the APS/MSP SONET properties. Which Layer 2 services should be considered to address this design feature?
A. Port-Channel
B. MLPPP
C. Flex Link
D. Ethernet Pseudowires

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