The initial and final table of a linear programming problem is assumed as follows. N $1 1 oo 2 $2 *, 3 * $1 RHS -8 -9 -6 -7 0 0 0 o 2 2 4 0 o 100 2 2 1 16 3 2 1 0 0 1 120 0 3 3 2 0 2 4470 0 0/8 2/2 0/6 0 O 0/6 -0/21 -0/6 18 o 04 0/2 0 04 28 z -012 36 sn 0 -16 014 A) Check the changing of x4 coefficient effect from 7 to 8 in the objective function. B) Check the changing of x2 coefficient effect from 5 to 9 in the objective function. P) Determine the range of changes of the x1 coefficient in the objective function. T) Check the changing of x3 coefficient effect from 6 to 7 in the objective function