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Which factor depends on the number of times of polling the port while executing the task?

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Which factor depends on the number of times of polling the port while executing the task?

(a) data

(b) data transfer rate

(c) data size

(d) number of bits

I had been asked this question in unit test.

My enquiry is from Introduction of Interrupts topic in section Interrupts and Exceptions of Embedded Systems

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Correct option is (b) data transfer rate

The explanation: The data transfer rate can determine the number of times the port is polled while executing the task.

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