What can be used not only to restrictdialing, but also to identify a subset of a subset of a wildcard pattern (when using the @ wildcard in the North AmericanDialingPlan)?

What can be used not only to restrictdialing, but also to identify a subset of a subset of a wildcard pattern (when using the @ wildcard in the North AmericanDialingPlan)?

A.
An IS sheet

B.
A ACL

C.
A Route Filter

D.
A DN top