When you migrate customer information from SAP ERP to SAP S/4HANA, what must you do? Please choose the correct answer.

When you migrate customer information from SAP ERP to SAP S/4HANA, what must you do? Please choose the correct answer.
A . Convert all open sales orders to the new data model
B . Convert all customers and vendors to business partners
C . Convert all vendors to customer master transactions
D . Update all custom code that calls customer master transactions

Answer: B