17. When in constant use, food-contact surfaces must be cleaned and sanitized at least every how many hours? 4 6 8 10

## Step 1<br />This problem is about understanding the guidelines for maintaining hygiene in food-contact surfaces. These surfaces are areas that come into contact with food, and therefore, it is crucial to keep them clean to prevent the spread of bacteria and other microorganisms that can cause foodborne illnesses.<br />## Step 2<br />The question asks for the minimum number of hours that food-contact surfaces must be cleaned and sanitized when in constant use. The options provided are 4, 6, 8, and 10 hours.<br />## Step 3<br />The correct answer is 4 hours. This is because the guidelines for maintaining hygiene in food-contact surfaces recommend that these surfaces be cleaned and sanitized at least every 4 hours when in constant use. This helps to ensure that any potential contaminants are removed, preventing the spread of bacteria and other microorganisms that can cause foodborne illnesses.