Four plates of equal area \( A \) are scparakd by equal distances \( d \) and are arranged as sh...

Four plates of equal area \( A \) are scparakd by equal distances \( d \) and are arranged as shown in the figure. The equivalent capacity is
(A) \( \frac{2 \varepsilon_{0} A}{c} \)
(B) \( \frac{3 \varepsilon_{0}-4}{d} \)
(C) \( \frac{3 \varepsilon_{n} \sim}{i t} \)
(D) \( \frac{\varepsilon_{0}, A}{d} \)