High availability at the transport network layer is provided through the combination of what three technologies? (Choose three.)

High availability at the transport network layer is provided through the combination of what three technologies? (Choose three.)
A . Alternate Route
B . Loop-Free Alternate Fast Reroute
C . BGP
D . HSRP
E . BFD
F . BGP Core and Edge Fast Reroute and Edge protection

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Answer: ABF