The solid angle subtended by the periphery of an area \( 1 \mathrm{~cm}^{2} \) at a point situat...

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The solid angle subtended by the periphery of an area \( 1 \mathrm{~cm}^{2} \) at a point situated symmetrically at a distance of \( 5 \mathrm{~cm} \) from the area is
(a) \( 2 \times 10^{-2} \mathrm{sr} \)
(b) \( 4 \times 10^{-2} \mathrm{sr} \)
(c) \( 6 \times 10^{-2} \mathrm{sr} \)
(d) \( 8 \times 10^{-2} \mathrm{sr} \)
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