Question

write the four layers of an operating system

Answer 1

Filename extension. One popular method used by many operating systems, including Windows, Mac OS X, CP/M, DOS, VMS, and VM/CMS, is to determine the format of a file based on the end of its name—the letters following the final period. This portion of the filename is known as the filename extension.
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Answer 2

Hey, here is your answer

They are -

1) User interface
2) File management system
3) Memory management
4) Kernel

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