how do users in SAP Ariba buying and invoicing send purchase orders to suppliers over Ariba Network?

how do users in SAP Ariba buying and invoicing send purchase orders to suppliers over Ariba Network?
A . The user creates a requisition when the requisition is approved a procurement buyer creates a purchase order and transmits it to the supplier
B . The user creates a requisition when the requisition is approved, SAP ariba procurement generates a purchase order and transmit it to the suppliers
C . The user creates a purchase order when purchase order is approved SAP Ariba procurement transmits it to the suppliers
D . The user creates a purchase order, when the purchase order is approved, a procurement buyer transmit it to the supplier

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Answer: B