Robots gather the items for orders shipped by Amazon from bins located in vast warehouses. Computers know what should be in every bin, but sometimes items are missing from a bin. Evaluate the following strategies for learning the prevalence of missing items from storage bins.

(a) Close the warehouse and conduct a comprehensive audit of the contents of every storage bin.

(b) Ask packers to record the number of missing items during evening hours when they are not as busy.

(c) Sample bins using orders composed of randomly selected items stocked in the warehouse.