Your Organization Has User Identities in Active Directory

Your organization has user identities in Active Directory. Your organization wants to use Active Directory as their source of truth for identities. Your organization wants to have full control over the Google accounts used by employees for all Google services, including your Google Cloud Platform (GCP) organization. What should you do?

A) Use Google Cloud Directory Sync (GCDS) to synchronize users into Cloud Identity.
B) Use the cloud Identity APIs and write a script to synchronize users to Cloud Identity.
C) Export users from Active Directory as a CSV and import them to Cloud Identity via the Admin Console.
D) Ask each employee to create a Google account using self signup. Require that each employee use their company email address and password.