A network consultant is considering potential upgrades for a network that utilizes an edge router that connects to a layer 2 switch, which has ports sub interfaced into multiple VLANs per port. Suggest an upgrade that will increase the efficiency of routing between VLANs by mapping IP addresses to MAC addresses for hardware forwarding. 

A.Replace the Layer 2 switch with a hub 

B.Replace the Layer 2 switch with a bridge 

C.Replace the Layer 2 switch with a Layer 3 switch 

D.Replace the edge router with a router/firewall combination device