Which of the Following Is Correct Regarding What a Customer

Which of the following is correct regarding what a Customer Transaction includes?

A) Entering invoices,Receiving customer payments,Entering estimates,Entering credit memos for reductions to customer accounts,Entering sales receipts,and Entering refund receipts
B) Entering receipts,Receiving customer payments,Entering payments,Entering debit memos for reductions to customer accounts,Entering payment vouchers,and Entering vendor statements
C) Entering invoices,Receiving shipping documentation,Entering payments,Entering debit memos for reductions to customer accounts,Entering sales receipts,and Entering refund receipts
D) Entering tax return information,Receiving discounts,Entering estimates,Entering credit memos for reductions to customer accounts,Entering sales receipts,and Entering refund receipts