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A disk of radius a/4 having a uniformly distributed charge \( 6 C \) is placed in the \( x-y \) plane with its centre at \( (-a / 2,0,0) \). A rod of length a carrying a uniformly distributed charge \( 8 C \) is placed on the \( x \)-axis from \( x=a / 4 \) to \( x=5 a / 4 \). Two point charges \( -7 C \) and \( 3 C \) are placed at \( (a / 4,-a / 4,0) \) and \( (-3 a / 4,3 a / 4,0) \), respectively. Consider a cubical surface formed by six surfaces \( x=\pm a / 2, y=\pm a / 2, z=\pm a / 2 \). The electric flux through this cubical surface is [IIT-JEE 2009]
(a) \( \frac{-2 C}{\varepsilon_{0}} \)
(b) \( \frac{2 C}{\varepsilon_{0}} \)
(c) \( \frac{10 C}{\varepsilon_{0}} \)
(d) \( \frac{12 C}{\varepsilon_{0}} \)
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