Which are the courses with the most number of professors? State the course ID and the level of the course.
courses refers taughtBy.course_id; most number of professors  refers to max(count(taughtBy.p_id)); level of the course refers to courseLevel
SELECT T1.course_id, T1.courseLevel FROM course AS T1 INNER JOIN taughtBy AS T2 ON T1.course_id = T2.course_id GROUP BY T1.course_id, T1.courseLevel ORDER BY COUNT(T1.course_id) DESC LIMIT 1