Which condiment is typically automatic on an Italian sandwich?

The correct choice highlights that mayonnaise is the condiment most commonly found on an Italian sandwich. This is due to mayonnaise's creamy texture and ability to complement the flavors of the meats, cheeses, and other ingredients typically present in Italian sandwiches. Italian sandwiches often feature robust flavors from ingredients like salami, prosciutto, or peppers, and mayonnaise serves as a unifying agent, enhancing moisture and richness without overpowering the other components.

Ketchup and mustard are generally not associated with Italian sandwiches in traditional recipes, as they tend to lean more towards American or deli-style sandwiches. The option indicating "none" would suggest that no condiment is typical, which overlooks the common use of mayonnaise in this context. Thus, mayonnaise stands out as the automatic choice for enhancing the taste of an Italian sandwich.