If \( \ell \) and \( m \) are lengths of the sub-tangent and sub-normal to the curve \( \beta y^...

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If \( \ell \) and \( m \) are lengths of the sub-tangent and sub-normal to the curve \( \beta y^{2}=(x+\gamma)^{3} \) then \( (\alpha \) means proportional to \( ) \)
(a) \( \ell^{2} \alpha m \)
(b) \( \ell \propto m^{3} \)
(c) \( \ell^{2} \alpha m^{3} \)
(d) \( \ell^{2} \propto m^{2} \)
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