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 $= (\text{strain}) \times \text{stress}$
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