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Two cylinders of same cross-section and length \( L \) but made of two materials of densities \( d_{1} \) and \( d_{2} \) are connected together to form a cylinder of length \( 2 L \). The combination floats in a liquid of density \( d \) with a length \( L / 2 \) above the surface of the liquid. If \( d_{1}d_{2} \), then
(a) \( d_{1}\frac{3}{4} d \)
(b) \( \frac{d}{2}d_{1} \)
(c) \( \frac{d}{4}d_{1} \)
(d) \( d_{1}\frac{d}{4} d \)
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