What is the key consideration during design phase for a service provider to ensure that they can effectively process the termination of a service instance?

What is the key consideration during design phase for a service provider to ensure that they can effectively process the termination of a service instance?
A . Create a retention period for private user data and user PCI data
B . Provide a chargeback bill or showback report to ensure account closure
C . Incorporate a service grace period to prevent the actual deletion of the instance
D . Archive the associated service data regardless of the user requirements

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Answer: B