单选题How is an RSVP resv message sent back to the ingress router?（）A reverse path of the RROB least cost to the ingress routerC shortest path to the egress routerD reverse path of the path vector TLV
题目
单选题
How is an RSVP resv message sent back to the ingress router?（）
A
reverse path of the RRO
B
least cost to the ingress router
C
shortest path to the egress router
D
reverse path of the path vector TLV