Which Description Is Correct About Connecting an IP Multicast Domain

Which description is correct about connecting an IP multicast domain that is operating in PIM dense mode to a PIM sparse mode domain?

A) The interconnection must be made at the rendezvous point of the PIM sparse mode domain.
B) The connection can be made at any location in the network, but PIM sparse mode and PIM dense mode cannot inter-operate; IGMP must be used to provide the interconnection.
C) The connection can be made at any location in the network, as PIM sparse mode will inter-operate seamlessly with PIM dense mode.
D) PIM dense mode and sparse mode domains are not inter-operable and cannot be connected.