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The correct answer is based on food safety guidelines that dictate the maximum allowable time for cooling potentially hazardous foods (PHF). Cooling PHF to 70 degrees Fahrenheit must occur within a maximum of 2 hours to minimize the risk of bacterial growth, which can lead to foodborne illnesses. This guideline is part of a larger food safety protocol known as the two-stage cooling method, which further encourages food to be cooled to 41 degrees Fahrenheit or lower within a total of 6 hours.

When cooling foods, it is critical to do so quickly to prevent the temperature from remaining in the "danger zone" (between 41°F and 135°F), where bacteria thrive. Thus, adhering to the 2-hour rule is essential in ensuring safety and compliance with health regulations. This is why the option stating 2 hours is correct, as exceeding this time frame can lead to unsafe food conditions.