What two features can be configured on the WAN routers to automate failover for both outbound and inbound traffic?

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A company requires redundancy for its multi-homed BGP external connections.

What two features can be configured on the WAN routers to automate failover for both outbound and inbound traffic? (Choose two)
A . AS path prepending
B . local preference
C . floating static route
D . HSRP
E . MED
F . weight

Answer: AB