Answer the following with relational algebra.

a. Retrieve the names of all employees in department 5 who work more than 10 hours per week on the ProductX project.

b. List the names of all employees who have a dependent with the same first name as themselves.

c. Find the names of all employees who are directly supervised by Franklin Wong.

DEPARTMENT DEPT_LOCATIO PROJECT \begin{tabular}{|l|l|} \hline Pname & Pnu \\ \hline \end{tabular} WORKS_ON DEPENDENT