The most popular operating systems are typically categorized as single-user, multitasking and multi-user systems.
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Single-user, multitasking: This type of operating system allows one user to run multiple applications at the same time. Examples include Windows, macOS, and Linux.
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Multi-user: These systems allow multiple users to access and use the system simultaneously. Examples include Unix and certain versions of Linux.
Thus, the correct responses would be single-user, multitasking and multi-user.