What settings must be made to ensure this?

Your customer wants to maintain the current customer and supplier account numbers even after migrating to business partners. The customer also wants to ensure the account numbers continue to be aligned after the conversion .

What settings must be made to ensure this?
A . Use external number ranges in the customer and supplier account groups for the conversion and switch to internal afterward
B . Use internal number ranges in the BP groupings for the conversion and switch to external afterward
C . Use internal number ranges in the customer and supplier account groups for the conversion and switch to external afterward
D . Use external number ranges in the BP groupings for the conversion and switch to internal afterward

Answer: A