What is a manual configuration step that is required before being able to use scope item Subscription Management with Sales Billing (57Z)?

What is a manual configuration step that is required before being able to use scope item Subscription Management with Sales Billing (57Z)?
A . Set-up a special document type for the solution order.
B. Define a new business partner category for a subscription user.
C. Maintain a Communication User, System and Arrangement.
D. Define an item category to identify a subscription in a service order.

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Answer: B