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Which of the following best characterize by Memory Mapped -I/O?

$A)$ Additional hardware for bus is required to control the IO bus and memory bus.

$B)$ Some of the address space is separated from memory space and assigned them to I/O ports.

$C)$ Common bus is used but to differentiate between memory and I/O different control signal is used

$D)$ None of these

I havenot got this answer to Galvin. Someone plz. give the concept used here .

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