What does administrative distance refer to?

What does administrative distance refer to?

A.
the cost of a link between two neighboring routers

B.
the advertised cost to reach a network

C.
the cost to reach a network that is administratively set

D.
a measure of the trustworthiness of a routing information source

Explanation:
Administrative distance is the first criterion that a router uses to determine which
routing protocol to use if two protocols provide route information for the same destination.
Administrative distance is a measure of the trustworthiness of the source of the routing
information. The smaller the administrative distance value, the more reliable the protocol.