Question

Which figure is formed by the intersection of this cube and the plane, which is perpendicular to four of the cube’s sides

Answer 1

A diagram for this problem would be great but it would be that we are to envision our own diagram.

What I see is that the four lateral edges of a cube are perpendicular to the square base of the cube. So, the four lateral faces of the cube could be thought of as 4 planes perpendicular to the plane containing the base of the cube. That intersection, points common to the plane as well as to the cube, would be a square face of the cube.

If you have a diagram, please post it.
@lil_d_love