In which two ways does the IPv6 First-Hop Security Binding Table operate? (Choose two)

In which two ways does the IPv6 First-Hop Security Binding Table operate? (Choose two)
A . by IPv6 routing protocols to securely build neighborships without the need of authentication
B . by the recovery mechanism to recover the binding table in the event of a device reboot
C . by IPv6 HSRP to make sure neighbors are authenticated before being used as gateways
D . by various IPv6 guard features to validate the data link layer address
E . by storing hashed keys for IPsec tunnels for the built-in IPsec features

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Answer: B D