问题：

[单选] 查询出EMP表中1982年及以后入职的员工信息（）（注：字段hiredate为入职日期，数据类型为DATE型）

A . select * from emp where hiredate>='19820101';
B . select * from emp where hiredate>=to_char('19820101','YYYYMMDD');
C . select * from emp where to_date(hiredate,'YYYYMMDD')>='19820101';
D . select * from emp where to_char(hiredate,'YYYYMMDD')>='19820101'