Explanation:

- Option 1: Windows OS

- Windows OS is an operating system, not an application software.

- It manages hardware and software resources on a computer.

- Option 2: MS Word

- This is application software.

- It is designed for word processing tasks like creating and editing documents.

- Option 3: Linux Kernel

- The Linux Kernel is part of an operating system and manages low-level tasks.

- It is not application software.

- Option 4: BIOS

- BIOS stands for Basic Input/Output System.

- It initializes and tests hardware components during the boot process.