3- In the simplex method for solving a LP problem, to determine the pivot column we select in the last row of the table.. a) The largest positive number b) the smallest negative number c) any negative number d) any, positive number 4- In the simplex method for solving a LP problem, we get the final table when the last row in this table has a) all negative numbers b) only one negative number c) no negative numbers d) at least one negative number