Why might an advertising agency use job costing for an advertising campaign by pepsico, whereas a bank might use process costing to determine the cost of checking account deposits? a. whenever a product or service is unique or distinct, process costing is the most efficient way to assign costs. therefore since each banking transaction is unique, the banks use process costing to determine the cost of checking account deposits. b. an advertising agency provides the same service to all its clients, while a bank supplies its customers with specialized services. for that reason an advertising agency would use job costing to monitor the costs of an advertising campaign by pepsico. c. job costing enables all the specific aspects of each job to be identified, whereas process costing can be used to compute the cost of numerous identical or similar services. d. job costing can be used to compute the cost of masses of similar services, in contrast process costing enables all the specific aspects of each job to be identified individually.