Refer to the exhibit.An engineer is designing a routing solution for a customer. The design must ensure that a failure of network 10.1.0.0/24, 10.1.2.0/24, 10.2...

Refer to the exhibit.An engineer is designing a routing solution for a customer. The design must ensure that a failure of network 10.1.0.0/24, 10.1.2.0/24, 10.2.1.0/24, or 10.2.3.0/24 does not impact the core. It also requires fast convergence time during any link failover in the core or access networks.Which solution must the engineer select?

A. Add aggregation layer between core and access networks. B. Enable graceful restart on routers A and C. C. Enable FRR for the connected networks of routers A and C. D. Enable summarization on routers A and C.