已知某MySQL 数据库中，有表及其字段如下：Employee（员工）表，字段：ID（标识，主键）、Name（姓名）、DepartmentID（班级标识，外键）Department（部门）表，字段：ID（标识，主键）、Name（名称）要查询各部门人数（包括空部门），可以使用的查询语句是（）。

A.SELECT Department.Name，COUNT（Employee.ID）’班级人数’FROM Department RIGHT JOIN Employee WHERE Department.ID =Employee.DepartmentID GROUP BY Department.Name，Employee.DepartmentID
B.SELECT Department.Name，COUNT（Employee.ID）’班级人数’FROM Department RIGHT JOIN Employee ON Department.ID =Employee.DepartmentID GROUP BY Department.Name，Employee.DepartmentID
C.SELECT Department.Name，COUNT（Employee.ID）’班级人数’FROM Department LEFT JOIN Employee WHERE Department.ID =Employee.DepartmentID GROUP BY Department.Name，Employee.DepartmentID
D.SELECT Department.Name，COUNT（Employee.ID）’班级人数’FROM Department LEFT JOIN Employee ON Department.ID =Employee.DepartmentID GROUP BY Department.Name，Employee.DepartmentID