Which payment method would Jorge find most appropriate for this situation?

Jorge is developing an e-commerce solution for his company, which sells subscription services.
Customers need to be billed on a recurring basis for their subscriptions. Which payment method
would Jorge find most appropriate for this situation?

A.
Advance payment using check or money order

B.
Purchase order and post-purchase billing

C.
Bank account debit

D.
Cash on delivery (c.o.d.)