What is the name of the cheeseburger at #6 on the menu?

The Ultimate Cheeseburger is designated as #6 on the Jack in the Box menu, making it the correct answer to this question. This item features two beef patties, two slices of American cheese, and is typically topped with lettuce, tomatoes, pickles, onions, and mayonnaise, providing a classic cheeseburger experience loved by many customers.

In the context of the other choices, while the Bacon Ultimate Cheeseburger and the Jumbo Jack are popular menu items at Jack in the Box, they do not represent the specific item listed at #6. The Spicy Chicken, on the other hand, is a completely different category of sandwich, focusing on chicken rather than beef. This helps to reinforce that the Ultimate Cheeseburger is indeed the correct answer for the menu item at that specific number.