单项选择题

变量v_time=’23-MAY-00’, 如下那条语句返回值为’01-JAN-00’?()

A.select round(v_time,’DAY’) from dual
B.select round(v_time,’YEAR’) from dual
C.select round(v_time,’MONTH’) from dual
D.A select round(to_char(v_time,’yyyy’)) from dual