1. The most important difference between the original Diners Club card and the charge cards that lar e department stores had been issuing to their customers was that . (ES, pp. 53-54 and . 81-82) A. the ers Club card could be used at multiple businesses whereas most charge cards could be us y at the store issuing the card . e Diners Club card was an example of a universal payment network C. the Diners Club card was for use at restaurants rather than retail stores D. payments with the Diners Club card were processed electronically