In an iostat report， which of the following options best describes the value of % iowait？（）

• A、 The amount of time taken to service an I/O interrupt
• B、 The percentage of time CPU（s） are waiting for page ins
• C、 The percentage of time the CPU9（s） are waiting on network
• D、 The percentage of time the CPU（s） are waiting for outstanding disk I/O requests