A triangular pyramid is cut by a plane. In which case is the cross section a quadrilateral?

Question

anonymous · Answer

When a plane intersects a plane, it forms a line. 
A triangular pyramid has four faces. 
To form four straight lines and therefore a quadrilateral, the intersecting plane must intersect all four faces.

anonymous · Answer

when the plane is perpendicular to the base and passes through the apex

when the plane is parallel to the base of the pyramid

when the plane intersects the base and two lateral faces of the pyramid

when the plane intersects the base and all three lateral faces of the pyramid
These are the options

anonymous · Answer

my answer is D.

xcharlizea · Answer

D is correct