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