What is the best description of a canape?

A canape is best described as a small, bite-sized appetizer that typically consists of a base, such as a piece of bread, cracker, or pastry, topped with a variety of flavorful ingredients. While it is indeed served cold, the combination of the base and toppings creates an elegant presentation that makes canapés ideal for cocktail parties and receptions. They are designed to be eaten in one or two bites, making them convenient for guests to enjoy while mingling.

The other options suggest different types of food; a heavy appetizer served warm would imply a much more substantial and filling dish, which contrasts with the light and delicate nature of a canape. A large entrée for sharing does not align with the canape's individual serving style, and a cocktail served in a glass does not relate to food items at all, as canapés are specifically focused on solid appetizers rather than beverages. Therefore, the classification of a canape as a small sandwich served cold captures its essence perfectly.