What is the Cisco IOS default behavior for switching from the shared tree to the shortest path tree
in PIM-SM operations?

A.
immediately after receiving the first packet on the shared tree for a given (S,G)

B.
after receiving over 1 kb/s traffic on the shared tree for a given (S,G)

C.
10 seconds after receiving the first packet on the shared tree for a given (S,G)

D.
30 seconds after receiving the first packet on the shared tree for a given (S,G)

E.
after receiving over 10 kb/s traffic on the shared tree for a given (S,G)