From the exhibit and the details given about the routes not installed in the FIB:

These two routes have a higher administrative distance value available to the destination networks

(Option A): Administrative distance is a measure used by routers to select the best path when there

are two or more different routes to the same destination from two different routing protocols. A

higher administrative distance means that the route is considered less trustworthy, thus not selected

for the FIB unless the more preferred routes fail.

These two routes will become primary, if the best routes are removed (Option B): In routing, if the

currently installed routes (which are considered the best due to reasons like lower administrative

distance) are removed or become unavailable, the next best routes based on administrative distance

will be used. This behavior ensures redundancy and maintains network connectivity in diverse

scenarios.

Reference:

This approach is aligned with standard routing protocol behavior as documented in networking

protocols and Fortinet’s routing mechanisms which prioritize routes based on administrative distance

and other metrics to maintain efficient and reliable network routing.