When configuring PIM operations, what is the effect of setting the SPT threshold to infinity?

A.	The multicast source to the RP path will never switch over to the shortest path tree
B.	All the PIM routers will have more (S,G) states, thus consuming more router resources
C.	The receivers will be able to immediately switch over to the shortest path tree after receiving the first multicast packets on the shared tree via the RP
D.	The last-hop routers will never switch over to the shortest path tree and will always remain on the shared tree