What special case in linear programming does the following graph depict?

A graph plots x $2$ versus x $1.$ The horizontal axis is labeled x $1.$ It ranges from $0$ to $10$ in increments of $2.$ The vertical axis is labeled x $2.$ It ranges from $0$ to $10$ in increments of $2.$ The graph shows $2$ falling lines labeled $2$ x $1+$ x $2<=7$ and x $1+$ x $2>=8.$ The line labeled $2$ x $1+$ x $2<=7$ falls from $(0,7)$ to $(3\mathrm{.}5,0).$ Two downward arrows are shown from the above line. The line labeled x $1+$ x $2>=8$ falls from $(0,8)$ to $(8,0).$ Two upward arrows are shown from the above line.

Multiple Choice

infeasibility

multiple optimal solutions

objectivity

unboundedness