View the exhibit. All switches shown in Exhibit 1 are HP Provision ASIC switches, which are implementing IGMP and multicast routing with PIM. Routing switch B has just received the message shown in Exhibit 2 from routing switch A. What can the network administrator assume?
A. Routing switch B is responding to routing switch A’s state refresh inquiry.
B. A host connected to routing switch B has joined the 239.0.0.1 group, and routing switch B wants to join the RP tree for this group.
C. Previously, routing switch B did not require 239.0.0.1 multicasts, but it now does due to a change in topology or IGMP reports.
D. A new multicast source for 239.0.0.1 has begun to transmit in a VLAN connected to routing switch B.
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