The figure below shows three identical capacitors, each with a capacitance of $($ Io uF $).$

points $($A$)$ and $($B$)$ are connected to a battery with a capacity of $($I$2)$ to fully charge the capacitors, what is the value of the energy stored in the capacitor $($Z$)$ in joules?

$180{10}^{-6}$

$720{10}^{-6}$

$80{10}^{-6}0$

$320{10}^{-6}$