Which One of the Following Statements About Measuring Capacity Is

Which one of the following statements about measuring capacity is best?

A) The maximum output rate for a restaurant would be the number of seats.
B) Output measures are the usual choice for flexible flow processes.
C) The utilization rate is expressed as the ratio of average output rate to either peak capacity or effective capacity.
D) Input measures are the usual choice of firms like Nissan Motor Company at its Tennessee plant.