you have clocked your customer and they arrive at an average of one every 10 min at your subway. you want to impress your boss by cutting employees down from 2 to 1. the cost savings would be huge. you realized that with 1 employee there is an average process time of 9.9 min. under what condition will your boss be really impressed by your innovation?

A the variability of arrival of customer is deterministic and process time is deterministic

B the variability of your process time is random and arrival time is deterministic

C the variability of your process time is random and arrival time is random

D the variability of arrival of customer is random and the process time is deterministic