Examine the description of the MARKS table: STD_ID NUMBER(4) STUDENT_NAME VARCHAR2(30) SUBJ1 NUMBER(3) SUBJ2 NUMBER(3) SUBJ1 and SUBJ2 indicate the marks obtained by a student in two subjects. Examine this SELECT statement based on the MARKS table: SELECT subj1+subj2 total_marks, std_id FROM marks WHERE subj1 > AVG(subj1) AND subj2 > AVG(subj2) ORDER BY total_ marks; What is the result of the SELECT statement? （）
- A The statement executes successfully and returns the student ID and sum of all marks for each student who obtained more than the average mark in each subject.
- B The statement returns an error at the SELECT clause.
- C The statement returns an error at the WHERE clause.
- D The statement returns an error at the ORDER BY clause.