Game theory related question.

In a bit of a rush, a timely detailed answer is much appreciative.

3. Consider the strategic form game given below. a) Find the highest symmetric payoff achievable in a correlated equilibrium with a public signal. b) Find the highest symmetric payoff achievable in a correlated equilibrium with a private signal. c) What can we say about the payoff (4, 4). Is it achievable in some equilibrium of this game