In the PIM-DM networking, regarding the process of SPT formation (without considering the state refresh mechanism), the correct description is:

In the PIM-DM networking, regarding the process of SPT formation (without considering the state refresh mechanism), the correct description is:
A . After the process of flooding and pruning, an SPT between the multicast source and the multicast receiver is formed
B . The diffusion-pruning process is carried out periodically
C . The pruned interface no longer sends multicast packets downstream
D . As long as the network topology and unicast routing information remain unchanged, the formed SPT tree will not change

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Answer: AB