Question: In memory - mapped I / O Question 2 options: main memory of the computing device is used for communicating with the I / O

In memory-mapped I/O
Question 2 options:
main memory of the computing device is used for communicating with the I/O devices using the standard I/O instructions.
main memory of the computing device is used for communicating with the I/O devices using the special I/O instructions.
address space of the computing device is used for communicating with the I/O devices using the standard I/O instructions.
address space of the computing device is used for communicating with the I/O devices using the special I/O instructions.

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