A parallel plate capacitor has a uniform electric field $\vec{E}$ in the space between the plates. If the distance between the plates is $d$ and the area of each plate is $A$, the energy stored in the capacitor is: (${ϵ}_0=\text{permittivity of free space}$)

1. A
   $\frac{1}{2}{ϵ}_0{E}^{2}Ad$
2. B
   ${ϵ}_{0}EAd$
3. C
   $\frac{1}{2}{ϵ}_0{E}^2$
4. D
   ${ϵ}_0{E}^{2}Ad$