Question:The STUDENT_GRADES table has these columns:
STUDENT_ID   NUMBER (12)
SEMESTER_END   DATE
GPA   NUMBER (4, 3)
Which of the following statements finds the highest Grade Point Average (GPA) per semester? 
A SELECT MAX(gpa) FROM student_grades WHERE gpa IS NOT NULL; 
B SELECT (gpa) FROM student_grades GROUP BY semester_end WHERE gpa IS NOT NULL; 
C SELECT MAX(gpa) FROM student_grades WHERE gpa IS NOT NULL GROUP BY semester_end; 
D SELECT MAX(gpa) GROUP BY semester_end WHERE gpa IS NOT NULL FROM student_grades; 
E SELECT MAX(gpa) FROM student_grades GROUP BY semester_end WHERE gpa IS NOT NULL;