Refer to the Exhibit

Refer to the exhibit. A customer wants to replace the core and aggregation layer of an existing network. Currently the network routes between the aggregation layer and core, and uses the technologies shown in the exhibit. The customer now wants to route at the core, instead of the aggregation layer, and extend some of the same VLANs in different buildings. However, the customer cannot eliminate the aggregation layer at this point. What should the architect recommend?

A) Create a backplane stack at the aggregation layer and a VSF fabric at the core.
B) Implement broadcast filtering on switch-to-switch links across all of the buildings.
C) Combine all switches in the aggregation layer and core into a single backplane stack.
D) Use VRRP on the core and aggregation switches, with the aggregation switches acting as standby.