A. discretionary channel costs
B. corporate-sustaining costs
C. distribution-channel costs
D. customer-sustaining costs
✅ The correct answer is option D.
In customer cost hierarchy, costs of individual customer support activities are classified as customer-sustaining costs. A customer-sustaining cost is the cost of resources consumed to service a customer regardless of the number of units sold to the customer.
In customer cost hierarchy, costs of individual customer support activities are classified as customer-sustaining costs. A customer-sustaining cost is the cost of resources consumed to service a customer regardless of the number of units sold to the customer.