What is true of MPLS TE?

A.
Only the ingress LSR must see the entire topology of the network.

B.
Every LSR needs additional information about links in the network, available resources, and
constraints.

C.
Every core router must be able to create an LSP tunnel on demand.

D.
Both RSVP and CR-LDP are used in conjunction to establish traffic engineering (TE) tunnels
and to
propagate the labels.

Explanation: