单选题What is the Cisco IOS default behavior for switching from the shared tree to the shortest path tree in PIM-SM operations？（）Aimmediately after receiving the first packet on the shared tree for a given （S，G）Bafter receiving over 1 kb/s traffic onthe shared tree for a given （S，G）C10 seconds after receiving the first packet on the shared tree for a given （S，G）D30 seconds after receiving the first packet on the shared tree for a given （S，G）Eafter receiving over 10 kb/s traffic onthe shared tree for a given （S，G）
单选题
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）
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