it is a polyhedron.
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All regular polygons.
No. All the faces of a Platonic solid are identical regular polygons.
A pentagonal prism
Only A (It is a closed figure) is true. The rest are incorrect because they define specific regular polygons. If you consider B (It is a quadrilateral), you must follow the logic that all quadrilaterals are polygons but not all polygons are quadrilaterals (an easier-to-follow example of this logic is: All fathers are male, but not all males are fathers).
A cube is a solid figure called a polyhedron. A polyhedron is a solid figure with all flat faces. So a cone would be a solid figure but not a polyhedron becasue it has a curve and does not have all flat faces.