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【单选题】
为尽量减少主机对繁杂FO控制的干预，I/O控制方式在不断地发展，如下对I/O控制方式的叙述正确的是( )。
A.
中断驱动I/O方式需要不断循环测试忙/闲标志
B.
仅当输完一个数据时，CPU才去进行中断处理，其他时间CPU与I/O并行工作的方式称为忙—等待方式
C.
DMA方式是数据块在设备与内存之间的直接传送，只有在传送多个数据块或传送开始和结束时才需要CPU的干预
D.
I/O通道控制方式额外增加了一个处理器专门来处 I/0请求，实现了CPU、通道和I/O设备间的并行工作
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