View the Exhibit.
Which three edit options for the STUDENTS table are valid? (Choose three.)
A.
Adding a new column
B.
Removing the Not Null constraint on the STUDENT_ID column
C.
Enforcing the primary key constraint on the COURSE_ID column
D.
Removing the Not Null constraint on the STUDENT_NAME column
E.
Enforcing the Not Null constraint on the DATE_OF_BIRTH column