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多项选择题 Examine the description of the MARKS table: STD_ID NUMBER(4) STUDENT_NAME VARCHAR2(30) SUBJ1 NUMBER(3) SUBJ2 NUMBER(3) SUBJ3 NUMBER(3) SUBJ1, SUBJ2, and SUBJ3 indicate the marks (grades) obtained by a student in the three subjects. Which two statements are valid? （）

A、SELECT SUM(subj1, subj2, subj3) FROM marks;

B、SELECT SUM(subj1 + subj2 + subj3) FROM marks;

C、SELECT SUM(subj1), SUM(subj2), SUM(subj3) FROM marks;

D、SELECT MAX(subj1, subj2, subj3) FROM marks;

E、SELECT MINIMUM(subj1) FROM marks;

F、SELECT COUNT(std_id) FROM marks WHERE subj1 >= AVG(subj1);

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