The energy density of an electromagnetic wave in a vacuum is given by the relation:
- A$\frac{E^2}{2\varepsilon_0} + \frac{B^2}{2\mu_0}$
- B$\frac{1}{2}\varepsilon_0 E^2 + \frac{1}{2}\mu_0 B^2$
- C$\frac{E^2 + B^2}{c}$
- D$\frac{1}{2}\varepsilon_0 E^2 + \frac{B^2}{2\mu_0}$
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