Refer to the exhibit.
A service provider requires building a multihop LDP neighborship between RTA and RTC routers. Which kind of message does RTA send to RTC to establish an LDP session?
A. a unicast targeted hello message as a UDP packet
B. a multicast targeted hello message as a UDP packet
C. a unicast targeted hello message as a TCP packet
D. a multicast targeted hello message as a TCP packet
