Which description of the main purpose of the LDP targeted Session is true?
A. To improve the label convergence time for directly connected LSRs by maintaining the session up when the link between LSRs by maintaining the session up when the link between LSRs down
B. To prevent traffic from being black-holed by building a MPLS forwarding table depending on the IP routing protocol in use
C. To establish an adjancency before exchanging network information to avoid keepalive messages being dropped during heay network traffic event
D. To provide the means for LSR to request and release label prefix binding information to peers routers
