There Are Two Hub-And-Spoke Networks in the Following Exhibit

Multiple Choice

There are two hub-and-spoke networks in the following exhibit. Each has about 60 branches spread over a wide area. Connect routers P4S-RE and P4S-RF to two different frame providers. Problems with one provider have impacted branches connected to the other provider and reaching the data center. Which is the best place to build flooding domain boundaries to isolate these WAN issues?

A) at routers P4S-RB and P4S-RC, because this will provide a good balance between separating the complex topologies behind routers P4S-RD, P4S-RE, and P4S-RF from the core and good route aggregation
B) at routers P4S-RB and P4S-RF, because this will provide good route aggregation and prevent routing along suboptimal paths in the case of link failure
C) at router P4S-RA, because this will provide optimal route aggregation and prevent suboptimal routing in the case of link failure
D) at routers P4S-RD, P4S-RE, and P4S-RF, because this will provide good route aggregation and also separate complex topologies within the network from one another