Router R1 lists 4 routes for subnet 10.1.1.0/24 in the output of the show ip eigrp
topology all-links command. The variance 200 command is configured, but no other
related commands are configured. Which of the following rules are true regarding
R1’s decision of what routes to add to the IP routing table? Note that RD refers to reported
distance and FD to feasible distancE.

A.
Adds all routes for which the metric is <= 200 * the best metric among all routes

B.
Adds all routes because of the ridiculously high variance setting

C.
Adds all successor and feasible successor routes

D.
Adds all successor and feasible successor routes for which the metric is <=
200 * the best metric among all routes

Explanation:
EIGRP considers only successor and feasible successor routes. Each of those
routes must have metrics such that variance * metric is less than the best route’s metric;
the best route’s metric is called the feasible distance (FD).