Question

after proper cooking, all foods that are to be held hot must be held at: 140°c or above 140°f or above 40°f or above room temperature until served

Explanation:

Food safety guidelines state that cooked foods to be held hot should be kept at 140°F or above to prevent the growth of harmful bacteria. Temperatures below this can allow bacteria to multiply. 140°C is much too high for regular food - holding. 40°F is the upper limit for cold - holding, and room temperature is not safe for extended holding of hot foods.

Answer:

140 °F or above