A company is implementing a SaaS solution with a large user base. SaaS solution licensing is user based, and user manage

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A company is implementing a SaaS solution with a large user base. SaaS solution licensing is user based, and user management is critical to keep the cost in check. Which of the following is the MOST efficient way to meet this requirement?

A. Have the administrator of the SaaS solution keep track of user activities.
B. Have a nightly upload to the SaaS provider of the current user base based on API call.
C. Have users remove their SaaS accounts when they no longer need the service.
D. Have a weekly user management script maintain the SaaS user base.