How can the Admin accomplish this?

The Admin at Universal containers has created a formula filed to calculate margin on the Quote Line object. This field should be hidden from all Users that are not Admins or management.

How can the Admin accomplish this?
A . Remove the margin field from the Quote Line Editor Field Set for relevant Profiles.
B . Remove the margin filed from the Quote Line Editor Field Set for relevant Roles.
C . Set Visible to false for relevant Profiles on the field-level security for the margin field.
D . Set Visible to false for relevant Roles on the field-level security for the margin field.

Answer: C