Which packets should the IPS forward for BFD to work under all circumstances?

A company plans to use BFD between its routers to detect a connectivity problem inside the switched network. An IPS is transparently installed between the switches.

Which packets should the IPS forward for BFD to work under all circumstances?
A . IP packets with broadcast IP source addresses
B . IP packets with identical source and destination IP addresses
C . fragmented packets with the do-not-fragment bit set
D . IP packets with the multicast IP source address
E . IP packets with the multicast IP destination address
F . IP packets with the destination IP address 0.0.0.0

Answer: B