Final answer:
Checking a roast's temperature to ensure it meets a critical limit is an example of the HACCP principle of monitoring, which is essential for food safety.
Step-by-step explanation:
The checking of a roast's temperature to ensure it has reached its critical limit of 145°F for 4 minutes is an example of the HACCP principle known as monitoring.
Under the Hazard Analysis Critical Control Point (HACCP) system, monitoring is a key principle that involves the regular checking and recording of temperatures, times, or other measurements to ensure a control measure at a critical control point (CCP) is under control.
By checking the roast's temperature, the cook is actively monitoring for a critical limit, which is a predefined temperature that must be reached to prevent, eliminate, or reduce a food safety hazard to an acceptable level.