Three Managers, John, Mary and Stephen Work for a Firm $$U = \sqrt { X }$$

Essay

Three managers, John, Mary and Stephen work for a Firm A. John's utility function is U = X² , Mary's is $$U = \sqrt { X }$$ and Stephen's is U= X .
Which one of them is risk averse, risk neutral and risk seeking?
Show graphically how their utility functions differ.