4364Any computer, be it a large PC or a small embedded computer, is useless if it has no means7552

Any computer, be it a large PC or a small embedded computer, is useless if it has no means to interact with the outside worl A.I/O communications for an embedded computer frequently happen over a bus called the (71)． B.I/O bus C.Memory Bus D.Device bus E.Intemal Bus 请帮忙给出正确答案和分析，谢谢！