Suppose we are given a linear programming problem with a feasible set S and objective function P = ax + by. Which of the following is correct?
1) The feasible set S represents all the possible solutions to the linear programming problem.
2) The objective function P represents the values of variables x and y in the linear programming problem.
3) The objective function P is maximized when the values of variables x and y are minimized.
4) The feasible set S represents the optimal solutions to the linear programming problem