Question

a food - contact surface must be cleaned and sanitized before working with a different type of food. only if the food handler changes gloves. at the end of the food handlers shift every 6 hours.

Explanation:

Food - contact surfaces need to be cleaned and sanitized to prevent cross - contamination. When switching to a different type of food, there is a risk of cross - contamination, so the surface must be cleaned and sanitized. Changing gloves doesn't necessarily mean the surface needs cleaning and sanitizing. End of shift and every 6 hours are not the most critical times compared to changing food types.

Answer:

A. before working with a different type of food.