Which of these is an example of PHF/TCS foods (potentially hazardous food/time controlled for safety)?

The classification of foods as potentially hazardous (PHF) or time/temperature controlled for safety (TCS) is based on their characteristics that may allow for the growth of harmful microorganisms if not handled properly. All the options provided—pizza, hamburgers, and tacos—contain ingredients that can support bacterial growth if they are not stored or cooked at the correct temperatures.

Pizza typically includes dairy products (cheese), meats, and vegetables, all of which can become unsafe if not held at proper temperatures after preparation. Hamburgers are made from ground beef, which is particularly susceptible to contamination and requires proper cooking and holding temperatures to be safe for consumption. Tacos can include a variety of perishable ingredients such as meat, cheese, and vegetables, which also need to be monitored closely to prevent foodborne illnesses.

Since all these foods share the same potential for becoming unsafe due to the presence of perishable ingredients, maintaining their safety through proper temperature control is essential. Therefore, recognizing that each example can be classified under the broader category of PHF/TCS foods solidifies why the inclusive answer of "All of these" is correct.