A fitness tracker is an example of a(n) ______ device.

A fitness tracker is classified as a mobile device because it is designed to be portable and used on-the-go, often integrating with smartphones and other mobile technologies to track fitness metrics such as steps taken, heart rate, and calories burned. Mobile devices are characterized by their ability to provide users with real-time data and access to applications while being easily transportable.

While "mixed" refers to devices that combine functions of different types, a fitness tracker does not fit that description as it primarily serves the specific purpose of tracking fitness metrics. "Standard" and "peripheral" options typically denote devices that do not have the same level of standalone functionality or portability as a fitness tracker, which operates independently or in sync with a mobile device. Therefore, the classification of a fitness tracker as a mobile device highlights its primary function and design as a portable technology that enhances health and fitness monitoring.