What defines a club sandwich?

A club sandwich is specifically recognized for its distinctive structure, which typically consists of two layers of fillings sandwiched between three slices of toasted bread. This double-decker arrangement is a hallmark of the club sandwich, allowing for multiple ingredients, often including turkey or chicken, bacon, lettuce, tomato, and mayonnaise. The complexity and height of the sandwich created by utilizing three slices of bread set it apart from simpler sandwiches that may have only one layer of fillings or a single bread slice.

The characteristics of the other options do not align with what defines a club sandwich. A club sandwich's defining feature is its double-decker form, which lends itself to the variety and combination of flavors that can be achieved, distinguishing it within the broader category of sandwiches.