Question: Question 21 (2 points) Which can be the correct Primary Key for the following GRADE_REPORT relation? G RAD E_RE PORT Student_ number Section _identifier -;-

_identifier -;- O a) Student_number O b) Student_number and Grade combined 6)

c) Student_number and Section_identifier combined 0 cl) Any of these can be

Question 21 (2 points) Which can be the correct Primary Key for the following GRADE_REPORT relation? G RAD E_RE PORT Student_ number Section _identifier -;- O a) Student_number O b) Student_number and Grade combined 6) c) Student_number and Section_identifier combined 0 cl) Any of these can be a primary key for GRADE_REPORT relation

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