单选题

观察下表（EMP）下列SQLSQL语句正确的是()

Question

A. SELECT ENAME, to_date(SYSDATE-HIREDATE,'yyyy-mm-dd') FROM EMP

B. SELECT ENAME, to_date(HIREDATE+10,'yyyy-mm-dd') FROM EMP

C. SELECT ENAME, to_char(HIREDATE-10,'yyyy-mm-dd') FROM EMP

D. SELECT ENAME, to_char(SYSDATE-HIREDATE,'yyyy-mm-dd') FROM EMP