Which two statements are true about RSVP and the IntServ QoS model?

Which two statements are true about RSVP and the IntServ QoS model?

A.
A drawback of implementing RSVP is the requirement to migrate to a supporting routing protocol.

B.
RSVP uses DSCP to signal QoS requirements to routers.

C.
RSVP is a routing protocol.

D.
RSVP is an IP protocol that uses IP protocol ID 46, and TCP/UDP ports 3455.

E.
RSVP specifically provides a level of service for rate-sensitive and delay-sensitive traffic.

F.
The flow-based approach of RSVP is ideal for large, scalable implementations such as the public Internet.