A local gas station has to place an order at the start of each month $($before they know true demand$)$ for a stack of magazines to sell in the station. Assume that the gas station owner has developed a newsvendor model to analyze the problem. Suppose $d$ is the demand for magazines that month, and $q$ is the number of magazines purchased by the gas station at the start of the month. What is the amount of understock magazines?

Max$(0,d-q)$

Min$(0,d-q)$

Min$(0,q-d)$

Max$(0,q-d)$