Parallel plate capacitor is constructed using three different dielectric materials as shown in fig.
 

The parallel plates, across which a potential difference is applied are of area A cm² and separated by a distance d cm. The capacitance across AB is

• A

  $\frac{{\mathrm{\epsilon }}_0\mathrm{A}}{\mathrm{d}}\left[\frac{{\mathrm{K}}_1}{2}+\frac{{\mathrm{K}}_2{\mathrm{K}}_3}{{\mathrm{K}}_2+{\mathrm{K}}_3}\right]$

• B

  $\frac{{\mathrm{\epsilon }}_0\mathrm{A}}{\mathrm{d}}\left[\frac{{\mathrm{K}}_1}{2}+\frac{\left({\mathrm{K}}_2+{\mathrm{K}}_3\right)}{{\mathrm{K}}_2{\mathrm{K}}_3}\right]$

• C

  $\frac{{\mathrm{\epsilon }}_0\mathrm{A}}{\mathrm{d}}\left[\frac{2}{{\mathrm{K}}_1}+\frac{{\mathrm{K}}_2{\mathrm{K}}_3}{{\mathrm{K}}_1+{\mathrm{K}}_3}\right]$

• D

  $\frac{{\mathrm{\epsilon }}_0\mathrm{A}}{\mathrm{d}}\left[\frac{2}{{\mathrm{K}}_1}+\frac{\left({\mathrm{K}}_2+{\mathrm{K}}_3\right)}{{\mathrm{K}}_1{\mathrm{K}}_3}\right]$