Which is not the layer of Operating System?
Correct answer: D. Critical Section
- A. Kernal
- B. Shell
- C. Application Program
- D. Critical Section
Explanation
The kernel, shell, and application programs are commonly described as parts or layers of an operating-system environment. A critical section is a concurrent-programming region that accesses shared data, not an operating-system layer.
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About Hardware and Software
Hardware includes the physical components of a computer, such as the CPU, motherboard, registers, memory, storage devices and peripheral equipment. Software covers system software, application software, utilities, drivers and firmware, with attention to how the operating system manages hardware and how software differs from the physical equipment it controls.
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