Le Pavilion Is a Historic Hotel Just Outside of Melbourne

Le Pavilion is a historic hotel just outside of Melbourne. It is owned by Refined Hotels, which operates additional properties in Sydney, Brisbane and Perth. Le Pavilion has 9 floors, with approximately 20 rooms per floor. Facilities also include a workout room, restaurant, and pool. The hotel is organised in 5 departments: front desk, engineering, housekeeping, food & beverage, and customer relations. As part of its operation, Le Pavilion regularly incurs the following costs: General manager's salary
Housekeeping supplies
Utility costs
Depreciation on workout room equipment
Advertising
Food and beverage costs
Depreciation on restaurant equipment
Which cost listed above is most likely to be a customer-sustaining cost?

A) Depreciation on workout room equipment
B) Utility costs
C) Housekeeping supplies
D) General manager's salary