Question

Arrange the following layers of MS DOS operating system starting from inner most to outer most.
(A). ROM BIOS Device drivers
(B). Resident System Program
(C). MS DOS Device Drivers
(D). Application Program

• A. (A), (C), (B), (D)
• B. (B), (D), (C), (A)
• C. (B), (A), (C), (D)
• D. (C), (B), (A), (D)

Hint:

The MS-DOS system consists of layers starting from hardware interaction (ROM BIOS) to user-level applications (Application Programs).

Answer 1

The Correct Option is A

Step 1: Understand the layers of MS-DOS.
The layers of the MS-DOS operating system can be arranged in the following order starting from the innermost to the outermost: - **(A) ROM BIOS Device Drivers**: These are the lowest level of the system and interact directly with the hardware. They are part of the ROM (Read-Only Memory).
- **(C) MS-DOS Device Drivers**: These drivers are used to control the system's devices and interact with the hardware through the ROM BIOS.
- **(B) Resident System Program**: This program is loaded into memory during the boot process and manages system functions like file handling, memory management, etc.
- **(D) Application Program**: This is the highest layer and refers to user programs or software that interact with the operating system to perform tasks.

Step 2: Conclusion.
The correct order of layers is **(A), (C), (B), (D)**.