Which two of these are characteristics of multicast routing? (Choose two.)

A.
multicast routing uses RPF.

B.
multicast routing is connectionless.

C.
In multicast routing, the source of a packet is known.

D.
When network topologies change, multicast distribution trees are not rebuilt, but use the original path

E.
Multicast routing is much like unicast routing, with the only difference being that it has a a group of receivers rather than just one destination

Explanation: