______is responsible for the attraction, selection, training, assessment,and rewarding of employees, while also overseeing organizational leadership and culture, and ensuring compliance with employment and labor laws.

A．Human resource management

B．Strategic analysis

C．Team management

D．RACI

如果一个圆柱体的侧面展开是一个正方形，那么这个圆柱体的高是它底面半径的[ ]

A．3.14   

B．π     

C．2π    

D．4π