Option 4: Rs 2,000 -> Operating Surplus represents the income that remains with producers after paying compensation to employees. It includes Rent (Rs 1,000) + Interest (Rs 500) + Royalty (Rs 300) + Profits (Rs 200) = Rs 2,000. Note that Wages & Salaries (Rs 2,000) and Employer's contribution to social security (Rs 200) are part of Compensation of Employees, which is NOT included in Operating Surplus. -> correct