although some sources say that the best operating point of service facility is at approx. 70% of the maximum capacity, the optimal utilization rate...

although some sources say that the best operating point of service facility is at approx. 70% of the maximum capacity, the optimal utilization rate depends on the content. In which of the following situations would it be most appropriate to operate at a relatively low percent of maximum capacity.

a. a dry cleaning / laundry operation

b. processing membership application submitted by mail

c. the local fire department

d. the Columbus crew stadium (seating for home games)

e. a flight on united airlines