Fairline Skyways Has a Significant Presence at the Charlotte International

Fairline Skyways has a significant presence at the Charlotte International Airport and therefore operates the Diamond Club, which is across from gate 36 in terminal 1. The Diamond Club provides food and business services for the company's frequent flyers. Consider the following selected costs of Club operation:
1) Receptionist and supervisory salaries
2) Catering
3) Terminal depreciation (based on square footage)
4) Airport fees (computed as a percentage of club revenue)
5) Allocated Fairline administrative overhead
Management is exploring whether to close the club and expand the seating area for gate 36.
Which of the preceding expenses would the airline classify as unavoidable?

A) 3.
B) 4.
C) 5.
D) 3, 5.
E) None of the answers is correct.