The region bounded above by y=x2 and below by the x–axis for 0≤x≤2 is the base of a solid. Cross sections taken perpendicular to the x–axis are squares. Which of the following integrals represents the volume V of the solid?
a) ∫02x2dx
b) 2∫02x4dx
c) ∫02x4dx
d) ∫04x4dx