By default, which of the following types of operating systems can automatically detect a user's location while the user is traveling in a bus?

Server operating systems are designed for data centers and network services and do not typically include location detection hardware or features for tracking a user's physical movement.

Desktop workstations are generally stationary and, while some might have GPS receivers, it is not a default or primary feature of their operating systems for automatic location tracking during travel.

Virtual servers run within a virtualized environment and inherit no physical location tracking capabilities independently of their host hardware, which is usually stationary.

Mobile operating systems, such as iOS and Android, are specifically designed for devices like smartphones and tablets that include built-in GPS receivers, Wi-Fi positioning, and cellular network triangulation capabilities to automatically detect and provide location services by default.