Hi, which one is the correct answer? thank you​

You will get 25 points an image of a rectangular prism is shown below: part a: a cross section of the prism is cut with a plane parallel to the base. what is the name of the shape created by the cross section? explain your answer. (5 points) part b: if a cross section of the prism is cut perpendicular to the base, what would be the shape of the resulting cross section? explain your answer. (5 points)

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?

2. explain in words how you plot the point (4, −2) in a rectangular coordinate system.