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A ____ can be used to prevent a user program from never returning control to the operating system.

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The answer is "timer" but I want to know why it is timer
This was the explaination provided.
"Timer is used to generate an interupt and ISR would make sure running the process again"
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I just doubt the answer is timer.... It is becoz at the timer interrupt for eg: in case of Round Robin, it is the CPU which saves the state of the current process into the PCB and kernel takes control to use the scheduler to launch the next process.
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Timer is used to genrate an Interrupt and Isr would make sure running a process again.

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