A customer has two Cisco Unified CallManager clusters, each with an IP-to-IP gateway. When deploying RSVP Call Admission Control between the Cisco Unified CallManager clusters using the IP-to-IP gateways, which two are required? (Choose two.)

A.
that an IP-to-IP gateway and a gateway or gatekeeper be configured as RSVP peers

B.
media flow-through

C.
media flow-around

D.
that the IP-to-IP gateways be configured as RSVP peers

E.
that the IP-to-IP gateways and the Cisco Unified CallManager clusters be configured with an RSVP agent