What, if anything, is required for communication to occur between the host C and Server 3?

Refer to the topology.

What, if anything, is required for communication to occur between the host C and Server 3?

A.
DHCP

B.
a router

C.
nothing is required

D.
trunk link between Sw-B and Sw-E

Explanation:

Since host C (VLAN 10) and Server 3 (VLAN 20) belong to different VLANs so we need a Layer 3 device (like a router) for inter-VLAN communication.