Why do packet loops occur during the configuration of BlDlR-PIM?

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Why do packet loops occur during the configuration of BlDlR-PIM?
A . The network does not support BIDIR-PIM
B . The network is partially upgraded to support BIDlR-PIM
C . No interface for carrying traffic for multicast groups has been configured
D . The router has not been configured to advertise itself

Answer: B