Why the following statement is erroneous?

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answerhappygod
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Why the following statement is erroneous?

Post by answerhappygod »

SELECT dept_name, ID, avg (salary)
FROM instructor
GROUP BY dept_name;
a) Dept_id should not be used in group by clause
b) Group by clause is not valid in this query
c) Avg(salary) should not be selected
d) None
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