LDP — options — udp 646, 711,tcp 646,711,multicast 224.0.0.1,multicast 224.0.0.2

LDP — options — udp 646, 711,tcp 646,711,multicast 224.0.0.1,multicast 224.0.0.2
LDP – TCP /UDP 646 & hello message it is targeted at “all routers on this subnet” multicast address 224.0.0.2
A. multicast 224.0.0.2 and UDP 646 hello
B.
C.
D.