Which of the Following LSPs Are Established in Downstream Unsolicited

Multiple Choice

Which of the following LSPs are established in Downstream Unsolicited (DU) label advertisement mode and ordered label distribution control mode? (Choose three.)

A) When the edge node finds a new destination address in its routing table that does not belong to any existing FEC, the edge node does not create a new FEC for the destination address.
B) An LSP is established by binding an FEC to a label and advertising the binding relationship to the neighboring LSR.
C) If the egress node has available labels for distribution, it allocates labels for the FEC and sends a label mapping message to the upstream node.
D) After receiving a label mapping message, the LSR adds the corresponding entry to the label forwarding table.