Explanation:

- Embedded systems are specialized computing systems that typically operate within specific devices but do not inherently focus on responding to events within a strict time frame.

- Real-time operating systems (RTOS) are specifically designed to respond to events or data within a clearly defined, predictable time frame, making them suitable for time-sensitive tasks.

- Multiuser operating systems allow multiple users to access the computer resources simultaneously, but they don't guarantee timing for event responses.

- Synchronized is not a standard term for any specific type of operating system.

Answer: Option 2 - Real time