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Which of the following items is a direct cost?

a) Customer service costs in a multi-product firm when Product A is the cost object
b) Printing costs incurred for payroll check processing when payroll check processing is the cost object
c) The salary of a maintenance supervisor in a multiproduct firm when Product B is the cost object
d) Utility costs of the administrative office when the accounting department is the cost object
e) None of the above