假设有学生表tb_student,其中有学号code 列是主键且是标识列,根据学号查询最后三名学生信息的sql语句,请选择正确的()
A. select top 3 * from tb_student
B. select top 3 * from tb_studen order by code asc
C. select top 3 * from tb_student order by code
D. select top 3 * from tb_student order by code desc