Question: In IO devices, _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ is a method to used to

In IO devices, ________________ is a method to used to address the device in which I/O registers are addressed in same space as memory and address decoder is used to distinguishe between them.
register-mapped I/O
memory-mapped I/O
separate I/O instructions
disk-mapped I/O

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