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A physical quantity of the dimensions of length that can be formed out of \( c, G \) and \( \frac{e^{2}}{4 \pi \varepsilon_{0}} \) is \( [c \) is velocity of light, \( G \) is universal constant of gravitation and \( e \) is charge]
(a) \( \frac{1}{c^{2}}\left[G \frac{e^{2}}{4 \pi \varepsilon_{0}}\right]^{1 / 2} \)
(b) \( c^{2}\left[G \frac{e^{2}}{4 \pi \varepsilon_{0}}\right]^{1 / 2} \)
(c) \( \frac{1}{c^{2}}\left[\frac{e^{2}}{G 4 \pi \varepsilon_{0}}\right]^{1 / 2} \)
(d) \( \frac{1}{c} G \frac{e^{2}}{4 \pi \varepsilon_{0}} \)
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