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Which of the following is necessary for the parallel input-output port?

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Which of the following is necessary for the parallel input-output port?

(a) inductor

(b) pull-up resistor

(c) push-up resistor

(d) capacitor

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This key question is from Parallel Ports in portion Basic Peripherals of Embedded Systems

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Right answer is (b) pull-up resistor

To elaborate: The I/O port needs an external pull-up resistor. In some devices, it offers internally. If it is not provided, it can cause incorrect data on reading the port and it prevents the port from turning off an external device.

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