An SQL statement to display the last name of the employees who is either a department manager or works on at least one project can be

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select lname from employee, department where dno = dnumber union select lname from employee, works_on where essn = ssn

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select lname from employee, department where mgr_ssn = ssn union select lname from employee, works_on where essn = ssn

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None of these

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select lname from employee, department where mgr_ssn = ssn union select lname from employee, project

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