Ascenario in which the optimal objective function contour line coincides with one of the binding constraint lines on the boundary of the feasible region leads to solutions.

The answer for this question is alternative optimal solution. The explanation this is a special case in which the optimal objective function contour line overlaps with one of the requisite constraint lines on the border of the feasible area will lead to alternative optimal solutions; in such circumstances, more than one solution offers the optimal value for the objective function.

the reason why your question keeps getting deleted because this is not a school related question : )

i will answer your question though.

i never tried church's