Ways by which computer buses can be used

Question

Write down the ways by which computer buses can be used to communicate with the memory and I/O.

Answer 1

i) Use two separate buses, one for the memory and other one for I/O.

ii) Use one common bus for both memories as well as I/O but encompass separate control lines for each.

iii) Use one common bus for memory as well as input with common control lines.