Refer to the exhibit. 
What is a method of modifying the External Phone Number Mask on multiple line appearances of
a directory number simultaneously?
A.
Bulk Administration > Phones > Add/Update Lines > Update Lines
B.
Bulk Administration > Users > Line Appearance > Update Line Appearance
C.
Call Routing > Directory Number > Directory Number Configuration > Edit Line Group
D.
Bulk Administration > Phones > Update Phones > Query
Explanation: