A taco truck manager wants to get more lunch time customers but doesn't know how much time it takes to process a single customer. The amount of time it takes to process a single customer will help the manager determine the maximum number of customers they can process in the lunch hour. On average, during lunch hour, 12 customers are in line (i.e. process) waiting to order at the window. Four customers per minute receive their food and leave the line (i.e. exit the process). Using Little's Law: How many customers can the process handle during the lunch hour? A. 4

B. 3

C. 12

D. 20