Which of the following is true for elastic potential energy density?
- AEnergy density $=$ $\frac{1}{2} \times \text{strain} \times \text{stress}$
- BEnergy density $=$ $(\text{strain})^2 \times \text{volume}$
- CEnergy density $=$ $\text{strain} \times \text{volume}$
- DEnergy density $=$ $\text{stress} \times \text{volume}$
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