A reach-in cooler or freezer is considered a packaged refrigeration system because it includes all necessary components within a single unit. Other options, such as walk-in coolers and rack systems, involve additional complexity and are not classified as packaged systems. Therefore, the correct choice is Option A.
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A packaged refrigeration system typically refers to a single unit containing all components for refrigeration. Among the options, reach-in coolers or freezers are considered packaged systems. Other options like walk-in systems or rack systems involve more complexity and are not classified as packaged. ;