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 onthe 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 onthe shared tree for a given (S,G)