Will medal and fan please help with these two queations

Which is the source document for bankcard sales?
Cash register tape
Sales slip
Receipt
None of the above

The accounts receivable controlling account in the general ledger:
Shows the total a mouth owned by all customers when posting is complete.
Helps keep the general ledger a balancing ledger in which debits equal credits.
Offers a means of testing the accuracy of the customer account balances.
None of the above

Question

Will medal and fan please help with these two queations 

Which is the source document for bankcard sales?
Cash register tape
Sales slip
Receipt 
None of the above 

The accounts receivable controlling account in the general ledger:
Shows the total a mouth owned by all customers when posting is complete.
Helps keep the general ledger a balancing ledger in which debits equal credits.
Offers a means of testing the accuracy of the customer account balances.
None of the above

mathmale · Answer

Could you eliminate any of the possible answers, and then share your own thoughts regarding which of the remaining possibilities is likeliest to be correct?