Four metallic plates, each with a surface area of one side A, are placed at a distance d apart from each other. The two inner plates are connected to point A and the other two plates to another point A as shown in fig. Then the capacitance of the system is

• A

  ${\mathrm{\epsilon }}_0\mathrm{A}/\mathrm{d}$

• B

  $2{\mathrm{\epsilon }}_0\mathrm{A}/\mathrm{d}$

• C

  $3{\mathrm{\epsilon }}_0\mathrm{A}/\mathrm{d}$

• D

  $4{\mathrm{\epsilon }}_0\mathrm{A}/\mathrm{d}$