According to the cost allocation procedures discussed on the Help screens for the Private Label Sales Report and the Marketing and Admin Report, which one of the following is included as part of a company's cost in supplying private-label footwear to chain retailers? A proportionate share of companywide advertising expenditures A proportionate share of corporate administrative expenses A proportionate share of companywide expenditures for retailer support A proportionate share of companywide costs for celebrity endorsement contracts A proportionate share of plant supervision costs, plant maintenance, and plant depreciation in those plants where private-label pairs are produced