Write SQL query to solve given problem: What is the average GPA of the students with the highest research capability and high salary? List the full names of the students.. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT AVG(T2.gpa), T2.f_name, T2.l_name FROM RA AS T1 INNER JOIN student AS T2 ON T1.student_id = T2.student_id WHERE T1.salary = 'high' AND T1.capability = 5 GROUP BY T2.student_id