Which of the following are responsibilities of the Designated Forwarder $($DF$)$ in BIDIR$-$PIM? $($Choose two.$)$

It is the only router that forwards packets traveling downstream $($toward receiver segments$)$ onto the link.

It is the only router that picks up upstream$-$traveling packets $($away from the source$)$ off the link and forwards them toward the RP$.$

It is the receiver for the multicast stream.

It is the Rendezvous Point $($RP$)$ for the multicast stream.

It is the sender for the multicast stream.