What is SAP’s recommendation for data filtering when using IDoc communication?

What is SAP’s recommendation for data filtering when using IDoc communication?
A . Use a condition filter in the middleware to ensure other integrations are NOT impacted and all filtering logic can be maintained in one central place
B . Use custom BAdis to ensure other integrations are NOT impacted by SAP Sales and Service Cloud integration
C . Use the standard filtering objects in the ALE distribution model. If this is NOT sufficient, use the IDOC_CREATION_CHECK BADI
D . Use the change pointers BADI, IDOC_DATA_MAPPER. If this is NOT sufficient, use the IDOC_CREATION_CHECK BADI

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Answer: C