Which of the following statements is/are true r...

Which of the following statements is/are true regarding memory-mapped I/O?

(A)The CPU accesses the device memory much like it accesses main memory. 
(B) The CPU uses separate architecture-specific instructions to access memory in the device. 
(C) Memory-mapped I/O cannot be used with a polling-based device driver. 
(D) Memory-mapped I/O can be used only with an interrupt-driven device driver.

A

B

C

D

Hint: 

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