WWhat is the correct answer

Variable cells Cell $B$6 Activity 1 $C$6 Activity 2 Name. $D$6 Activity 3 Constraints. Cell $E$3 $E$2 Resource A $E$4 Name Resource B Resource C Final Reduced Objective Value Cost Coefficient 3 6 0 Final Value 20 30 18 0 0 -7 Shadow Price 7.78 6 0 30 40 20 Constraint R.H. Side 20 30 40 Allowable Increase 23 50 7 Allowable Increase 10 50 1E+30 Allowable Decrease 17 10 1E+30 Allowable Decrease 12.5 10 22 If the right-hand side of Resource B is increased by 30, and the right-hand side of Resource C is decreased by 10, then: If the right-hand side of Resource B is increased by 30, and the right-hand side of Resource C is decreased by 10, then: O the shadow prices are valid. O None of the choices is correct. the optimal solution will change. O the shadow prices may or may not be valid. O the optimal solution remains the same