Which two are characteristics of RSVP?()

A. RSVP itself provides bandwidth and delay guarantees.

B. For RSVP to be end-to-end, all devices must support RSVP.

C. RSVP reservations are maintained by a centralized reservations server.

D. An RSVP compatible QoS mechanism must be used to implement guarantees according to RSVP reservations.