Zn identical metal plates each of area A are placed parallel to each other, equal spiced at distance 'd' between neigh bouring plates. The plates are connected alternatily. The capacitance of the system is

Question

$\begin{array}{1 1} \large\frac{2n \in_0 A}{d} \\ \large\frac{n \in_0 A}{d} \\ \large\frac{(2n-1) \in_0 A}{d} \\ \large\frac{(n-1) \in_0 A}{d} \end{array} $