Selected Answer: BC B, C There are two main RA Guard modes: Host mode (Default mode): In this mode, the RA Guard function assumes trusted ports are connected to hosts that do not send any Router Advertisement or Router Redirect messages. This mode drops all such messages if they are received on a trusted port. Router mode: In this mode, the RA Guard function allows trusted ports to send Router Advertisement and Router Redirect messages. This mode is configured when the trusted port is connected to a legitimate router.

Selected Answer: BC correct B and C https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipv6_fhsec/configuration/15-mt/ip6f-15-mt-book/ip6-ra-guard.html