What type of fries is included in the side options?

Curly fries are a popular side option at Jack in the Box and are known for their distinctive spiral shape and seasoned flavor. They are often highlighted on the menu for their unique texture and taste, which sets them apart from standard straight-cut fries. This makes them an ideal choice for customers who are looking for something a bit different from traditional french fries, contributing to their popularity as a side item within the menu offerings.

The other types of fries mentioned, although appealing, may not be standard offerings at Jack in the Box, thus making curly fries the correct answer in the context of the menu.