marco has an auto repair shop. when a customer needs his muffler replaced, marco orders the part immediately from the aaa parts supplier. marco likes to do business with aaa because of the speedy delivery of the needed parts. this allows marco to complete the repair job and not make his customer wait. why is it important for marco to choose the right distribution channel? a. to standardize service quality b. to make services available less often c. to ensure customer convenience d. to maintain a brand's image