A multicast network is sing Bidirectional PIM. Which two combined actions achieve high availability so that two RPs within the same network can act in a redundant manner? (Choose two)

Phantom RP addresses are IP addresses not assigned to any physical interface but reachable via routing; using two phantom RPs allows the network to shift traffic to the surviving RP automatically when the route to one phantom address is withdrawn after a failure.

Manipulating administrative distance affects route preference between routing sources but does not provide automatic failover and does not integrate with the Designated Forwarder election that BIDIR-PIM relies on.

Static multicast routes are manual and cannot dynamically react to RP failures the way routing protocol prefix changes can, making them unsuitable as the sole HA mechanism.

Simply advertising both RP addresses in the routing protocol provides no tiebreaker or failover logic; BIDIR-PIM cannot natively choose between two concurrently active RPs without a prefix-length or metric distinction.

Anycast RP with MSDP peering is a redundancy solution specific to PIM-SM; BIDIR-PIM does not use MSDP and uses a Designated Forwarder election tied to a single RP address, making this approach incompatible.

By advertising a longer (more specific) prefix route to the primary phantom RP and a shorter prefix to the backup, the network preferentially routes toward the primary RP and automatically fails over to the backup when the longer prefix is withdrawn from the routing table.