Explanation
In the question, we are given four options.
Option A is wrong because the point (2,1 ) fell outside the solution region
Option B is wrong because the point (2,1) fell on a broken line within the solution region.
Option C is right because the point (2,1 ) fell on a solid line in the solution region.
Option D is wrong because the point (2,1) fell on a broken line within the solution region.
