Flo's Deli is determining how to ensure that their current process of serving customers during lunch rush is adequate. Which of the following is an example of how the restaurant can monitor its process rather than outcome?

A. Dollar average of each customer's total spend during lunch rush

B. Average time between order received and order completed

C. Ask each customer how likely it is that they will revisit the restaurant

D. Number of orders sent back to the kitchen during lunch rush

Whats the answer?