A. The pages to and from paging space per secondB. The ……

When monitoring a system using /usr/bin/vmstat with an interval， the metrics under page pi and page po represent which of the following phrases？（）

A. The pages to and from paging space per second
B. The page intervals and page operations per second
C. The page interrupts and page operations per second
D. The page segments transferred between pi and po devices per second