The figure shows a capacitor having three layers of equal thickness...

The figure shows a capacitor having three layers of equal thickness and same area as that of plate. Layer I is vaccum, layer II is conductor and layer III is dielectric of dielectric constant \( \mathrm{K} \). The ratio of energy stored in region III to total energy stored in capacitor is:
a. \( \frac{1}{\mathrm{~K}+1} \)
b. \( \frac{3}{\mathrm{~K}+1} \)
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d. \( \frac{4}{3 \mathrm{~K}+1} \)