What are the main purposes$)$ of an operating system?

Interrupting the processor when an invalid instruction is executed.

To allocate the separate resources of the computer fairly and efficiently as needed to perform the required tasks.

To provide an environment for a computer user to execute programs on computer hardware in a convenient and efficient manner.

Management of the operation and control of I$/$O devices.

Supervision of the execution of user programs to prevent errors and improper use of the computer.