Question: When OS interacts with I / O devices for data transfer, OS polls the I / O devices for the completion status of the task.

When OS interacts with I

/

O devices for data transfer, OS polls the I

/

O devices for the completion status of the task. Such polling can lower the utilization of the CPU. To curb such waste, which two techniques are commonly adopted to maintain CPU utilization?

Trap

Interrupt

Context switch

Direct memory access

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