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

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

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Answer: D