Which category of indirect costs in the customer-cost hierarchy are costs of visits to customers or costs of displays at customer sites?

Question

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Costs of visits to customers or costs of displays at customer sites would be considered customer-sustaining costs. These costs are related to maintaining relationships with customers and promoting products or services to them, rather than being directly tied to the production or delivery of a specific product or service.

Which Category of Indirect Costs in the Customer-Cost Hierarchy Are