How are User Roles managed in SAP Fieldglass?

How are User Roles managed in SAP Fieldglass?
A . A set of permissions that cannot be changed are assigned to users.
B. Users choose their permissions based on their role in the workflow.
C. A set of permissions SAP Fieldglass created are assigned to users.
D. Permissions are assigned to users based upon their role in the workflow.

Answer: D