The front face of the cube is a square, drawn in the correct orientation. (Back face may also have been drawn). The other faces are parallelograms, drawn in the correct orientation.
easy
moderate
b)
The front face of the rectangular prism is a rectangle, dawn in the correct orientation. (Back face may also have been drawn). The other faces are parallelograms, drawn in the correct orientation and longer than the front face.
moderate
difficult
c)
The front face is an isosceles or equilateral triangle (allow a 1/2 square margin of error), drawn in the correct orientation. (Back face may also have been drawn). The other face is a parallelogram drawn in the correct orientation.