Choice "D" is correct. One of the benefits of EDI is that transactions are transmitted in a standardized manner with the same controls at all times because the transmission is done by an application system instead of by a person (unless the application controls are changed in some manner). This would mean that transactions would only be transmitted if they contained complete information.Choice "c" is incorrect. EDI does not have anything to do with antivirus software. It certainly does not eliminate the need to update antivirus software continuously; that need is still there. Virus software (actually the virus definitions, not necessarily the software itself) needs to be updated regularly; most anti-virus software vendors provide updated virus definitions on at least a weekly basis.
Choice "a" is incorrect. EDI has nothing to do with the automatic protection of information that has left the entity, electronically or in any other manner. Once data or information has left the entity, the entity can do nothing more to protect it. Any protection (such as encryption) would have to have been applied to the data or information before that data or information left the entity.
Choice "b" is incorrect. EDI does not have anything to do with the need to verify receipt of goods before making payment. Purchased goods should normally be received before payment is made (unless some kind of advance payment is being made). Once goods are received or payment is authorized by another means, the payment can be made, manually or by EDI, as appropriate.