( DO NOT ANSWER IF YOU DO NOT KNOW THE ANSWERS )

An image of a rectangular prison is shown below:

part A: a cross section of the prison is cut with a plane parallel to the base. what is the name of the shape created by the cross-section? EXPLAIN YOUR ANSWER.

Part B: if a cross section of the prison is cut diagonal to the base, what would be the shape of the resulting cross section? EXPLAIN YOUR ANSWER.