Which of the following is a recommended safety precaution when operating a deep fryer?

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Controlling heat and oil level is essential for safe deep-frying. Keeping the oil at the proper level prevents overflow and excessive foaming, while monitoring the temperature helps avoid overheating that can cause fires and rapid oil breakdown. This combination minimizes fire risk, protects equipment, and keeps the cooking process consistent. The other actions are dangerous: pouring water into hot oil causes violent splattering and a flash fire; leaving the fryer unattended during operation increases the chance of a fire spreading; storing flammables near the fryer creates a serious ignition hazard.