What defines the nearest router for a host?

A.
subnet mask

B.
default gateway

C.
DNS server

D.
WINS server

Explanation:
Default Gateways and DNS Servers

The default gateway is the first IP address of the device that a client computer will look for when attempting to gain access outside the local network.
This device could be a router, server, or other similar device; it is the device that grants access to the Internet or other networks.