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 MS-DOS operating system's layers, from innermost to outermost, are ordered as follows: - (A) ROM BIOS Device Drivers: These are the foundational layer, directly interfacing with hardware, and reside in ROM.
- (C) MS-DOS Device Drivers: These drivers manage system devices, communicating with hardware via the ROM BIOS.
- (B) Resident System Program: Loaded during boot, this program handles core system operations such as file and memory management.
- (D) Application Program: The outermost layer consists of user-executed programs that interact with the operating system for task completion.

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