Which option do you recommend according to SAP Ariba’s best practice?

Your customer wants to automatically assign approvers to supplier requests based on the supplier’s region.

Which option do you recommend according to SAP Ariba’s best practice?
A . Create a team member rules file in the Supplier Request template.
B . Enable chain rules in each approval node within the approval task
C . Upload a user matrix file in the SM Administration area.
D . Apply visibility conditions to region-specific project groups on the Team tab of the Supplier Request template.

Answer: A