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A. It is the size of the RSVP hello packet
B. It is how long it maintains RSVP neighbors
C. It is the length of time between RSVP hello packets
D. It is how long the router waits before declaring a router to be down

A. to perform a label push operation
B. to track the status of signaled LSPs
C. to perform longest-match route lookups
D. to reserve resources, such as labels and path information