A router is running three routing processes: RIP, OSPF, and EIGRP, each configured with default
characteristics. Each process learns a route to the same remote network.
If there are no static routes to the destination and none of the routes were redistributed, which
route will be placed in the IP routing table?

A.
the route learned through EIGRP

B.
the route learned through OSPF

C.
the route learned through RIP

D.
the route with the lowest metric

E.
all three routes with the router load balancing

Explanation:
http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094195.shtml
Administrative distance is the feature that routers use in order to select the best path.
Administrative distance defines the reliability of a routing protocol. Each routing protocol is
prioritized in order of most to least reliable (believable) with the help of an administrative distance
value. Lowest Administrative distance will be chosen first.