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What is polling in the context of I/O?

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What is polling in the context of I/O?

The process of laying poles (connections) between CPU, Memory, and any connected I/O devices.

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The process of the CPU copying data from disk.

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Reading the data register of every disk connected to the machine to find the correct one for the I/O request.

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The CPU repeatedly reading the status register of the I/O device while waiting for it to finish.

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