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Consider the following collection of relation schemes: Instructor (inst_name, deptname, salary) Department (deptname, building, budget) Committee (committee_name, commit_type, num_of_members) instructor_committee (inst_name, committee_name) Write Relational Query Expression to do the following: a. Find all the committee names where instructor Abdullah is a member b. Find the maximum given salary. C. Find the total number of instructors for each department