Which types of meats and cheeses should be caught and flipped during preparation?

The correct choice emphasizes that only round meats and cheeses need to be caught and flipped during preparation. This practice is important for ensuring that these items are handled properly to maintain their quality and presentation. Round meats and cheeses are often more delicate and require careful attention during preparation to prevent any damage, such as squishing or improper slicing.

In contrast, while it's vital to handle all meats and cheeses with care, the focus on round items specifically highlights the need for a precise technique to preserve their shape and texture. The preparation process helps in achieving an even cut and presentation, which is essential in a sandwich-making environment.

The other options present broader categories or exclusions which wouldn't focus on the specific technique necessary for round meats and cheeses, thus missing the point of ensuring they are handled effectively during the preparation process.