Question 14 5 pts Consider the LP problem with constraints : X1 + 2x2 6 X1, X2 > 0 Which of the following methods can be used to solve this? Add slack variables and apply the dual simplex method. Add slack variables as needed and proceed with the (regular) simplex method. Add slack variables and artificial variables and apply the revised simplex method. Add slack variables and apply the two phase simplex simplex method