Which of these statements best describes the purpose of route filters?

A.
Routefilters are assigned to route plans to reduce the size of the calling search space.

B.
Routefilters are assigned to wild card route patterns by using the % character and reducing the number of dial peers required.

C.
Routefilters are assigned to calling search spaces, are typically used with the @ route filter, and result in reducing the size of the route plan.

D.
Routefilters are assigned to route patterns, are used only with the @ route pattern, and are geared toward reducing the number of route patterns required.