【单选题】

Of the items listed below, which one(s) should be saved into the process control block?Ⅰ.Process name and process numberⅡ.Process running informationⅢ.Current opened file information

A . Ⅰ and Ⅱ
B . Ⅰ and Ⅲ
C . Ⅱ and Ⅲ
D . Ⅰ、Ⅱ and Ⅲ