How should an administrator grant proper access to the supervisors?

Supervisors at Universal Containers have read access to Contacts through their profiles. Sales reps have a separate profile that allows them to edit Contacts. Some sales reps are attending a conference for a week and supervisors will need to fill in to update Contact details while they are out.

How should an administrator grant proper access to the supervisors?
A . Assign a permission set with the edit permission on Contact to the supervisors that need it.
B . Update the supervisor profile with edit permission on Contact.
C . Create a sharing rule to grant read/write access on Contact to the supervisor role.
D . Change the supervisor users profiles to be sales rep.

Answer: B