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A two point charges \( 4 q \) and \( -q \) are fixed on the \( x \)-axis at \( x \) \( =-d / 2 \) and \( x=d / 2 \), respectively. If a third point charge \( q \) is taken from the origin to \( x=d \) along the semicircle as shown in the figure, the energy of the charge will
(a) Decrease by \( \frac{q^{2}}{4 \pi \varepsilon_{0} d} \)
(b) Decrease by \( \frac{4 q^{2}}{3 \pi \varepsilon_{0} d} \)
(c) Increase by \( \frac{2 q^{2}}{3 \pi \varepsilon_{0} d} \)
(d) Increase by \( \frac{3 q^{2}}{4 \pi \varepsilon_{0} d} \)
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