Fig. 3 shows a pyramid on top of a cuboid. The height of the pyramid is b cm and the square base of both shapes has side s cm. Find the volume of the shape.

• A.s²(H + h)cm³
• B.s²(H + h)cm³
• C.¹/₃s²(H + h)cm³
• D.⅓s²(3H + h)cm³