A convex lens ' \( A \) ' of focal length \( 20 \mathrm{~cm} \) and...

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A convex lens ' \( A \) ' of focal length \( 20 \mathrm{~cm} \) and a
\( \mathrm{P} \) concave lens ' \( B \) ' of focal length \( 5 \mathrm{~cm} \) are kept along the same axis with a distance ' \( d \) ' between them. If
W a parallel beam of light falling on ' \( A \) ' leaves ' \( B \) ' as a parallel beam, then the distance ' \( d \) ' in \( \mathrm{cm} \) will be
(a) 30
(b) 25
(c) 15
(d) 50
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