Choice "A" is correct. The best definition of EDI is electronic (computer-to-computer) exchange of business transaction documents (business information). EDI is always between two separate businesses (not internally).
Choice "b" is incorrect. It is difficult to determine exactly what the transmission of "customers' funds-related transactions" means. Does it mean credit card purchases? Does it mean the transfer of funds between the merchants and the banks to pay for those purchases? In either case, however, it is unlikely to be EDI; although, this choice is probably the second best answer.
Choice "d" is incorrect. Transmitting entered sales data to a central processor would be internal data communication. For internal data transfers, there is no reason to bother with all of the format translation that is necessary with EDI transactions.
Choice "c" is incorrect. Access to products and product information is not EDI. EDI is electronic (computer-to-computer) exchange of business transaction documents (business information) and is always between two separate businesses (not internally).
