A retail establishment closes each evening. If the establishment is open from 9 am to 5 pm, the objective of a simulation might be to estimate some measure of the quality of customer service over the period beginning at 9 am and ending when the last customer who entered before the doors closed 5 pm has been served. What type of model is the above model according to the output analysis? Give the model type and write 3 reasons with short sentences to justify your answer below