Refer to the exhibit.

While configuring dial plan on a system, an engineer notices the route list in the pictured state.
What will cause this?

A.	One subscriber server in CUCM Group is down.
B.	Media Resource on the CUCM are oversubscribed.
C.	"Run on all active unified CM nodes" is not checked on the route list.
D.	"No route group" is added in this Route List.