Which two are characteristics of RSVP? (Choose two.)
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.