What CSS should be assigned to a phone in the Phones partition to allow calls to Service and Local numbers while blocking all other calls?

Exhibit

Study the exhibit. What CSS should be assigned to a phone in the Phones partition to allow calls to Service and Local numbers while blocking all other calls?

A.
CSS Certkiller A

B.
CSS Certkiller B

C.
CSS Certkiller C

D.
CSS Certkiller D