What is the difference between Link LDP and targeted LDP?

What is the difference between Link LDP and targeted LDP?

A.
Link LDP uses port 646 and targeted LDP uses port 711.

B.
LDP Hellos use unicast UDP for targeted and multicast UDP for link.

C.
Link LDP uses UDP for discovery and targeted LDP uses TCP for discovery.

D.
Link LDP uses port 711 and targeted LDP uses port 646.

E.
None of the above are true.