Examine the description of the STUDENTS table:<br /> STD_ID NUMBER(4)<br /> COURSE_ID VARCHAR2(10)<br /> START_DATE DATE<br /> END_DATE DATE<br /> Which two aggregate functions are valid on the START_DATE column? ()
A、SUM(start_date)
B、AVG(start_date)
C、COUNT(start_date)
D、AVG(start_date, end_date)
E、MIN(start_date)
F、MAXIMUM(start_date)