During a Corporate Merger, a Network Designer Is Asked for a Solution

During a corporate merger, a network designer is asked for a solution that will provide connectivity between the two enterprise networks. The solution must have the ability to support video sessions so that the CEO can message merger activities to the employees. The designer decides to consider multicast as a transport with MSDP to provide redundancy. Which transport feature does the network designer need to apply to the interconnecting firewall to ensure that Source-Active messages between the MSDP peers can be sent in both enterprise networks?

A) unicast over a UDP connection
B) multicast over a UDP connection
C) unicast over a TCP connection
D) multicast over a TCP connection