Choose the INCORRECT option for the equation of elongation of a uniform rod having length L dueto the self weight W.

A

$$\delta = \frac{WL}{2AE}$$

B

$$\delta = \frac{2WL}{AE}$$

C

$$\delta = \frac{WL}{AE}$$

D

$$\delta = \frac{2WL}{AE}$$ and $$\delta = \frac{WL}{AE}$$ both