A new multicast server is being added to an existing PIM Sparse mode network. Which device in this network must the new server register with before its multicast traffic can be dispersed throughout th

An IGMP Querier is responsible for discovering multicast group members on a local LAN segment, not for registering multicast sources with the wider PIM network.

The local PIM router (specifically the DR for the source's segment) is the first hop for the multicast source but forwards the registration information to the RP; it is not the ultimate registration point itself for the entire network.

A local IGMP switch operates at Layer 2 to optimize multicast forwarding on a LAN by listening to IGMP messages from receivers, but it is not involved in multicast source registration for the PIM domain.

In PIM Sparse Mode, sources send their traffic to a Rendezvous Point (RP) which acts as a meeting point between sources and receivers. The source's Designated Router (DR) encapsulates the initial multicast packets in a PIM Register message and forwards them to the RP, which then creates a source-specific tree (SPT) or shared tree (RPT) for distribution.