Which cheese option is not available at Denny's?

Provolone is not available at Denny's, making it the correct choice in this context. Denny's offers a variety of cheeses, including Cheddar, Swiss, and American, which are commonly used in their menu items such as sandwiches, burgers, and breakfast dishes. Provolone, while a popular cheese choice in some dining establishments, is typically not part of Denny's standard cheese offerings. This distinction reflects the restaurant's focus on certain types of cheeses that fit well with their established menu and customer preferences. Knowing the available cheese options can aid servers in accurately answering customer inquiries and enhancing their dining experience.