Moment of inertia (about its neutral axis) of hollow rectangular section with overall width and depth as B and D and hollow rectangular hole as b and d is

A

$$\frac{1}{16}(BD^3 - bd^3)$$

B

$$\frac{1}{32}(BD^3 - bd^3)$$

C

$$(BD^3 - bd^3)$$

D

$$\frac{1}{12}(BD^3 - bd^3)$$