“教师表”中有“职工号”、“姓名”、“工龄”和“系号”等字段，“学院表”中有“系名”和“系号”等字段。求教师总数最多的系的教师人数，正确的命令是（）。

A．
B．
C．
D．

A．CREATE CLASS mylib OF student As Person
B．CREATE CLASS student OF Person As mylib
C．CREATE CLASS student OF mylib As Person
D．CREATE CLASS Person OF mylib As student