If the volume of a sphere increases at constant \( \mathrm{P} \) ra...

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If the volume of a sphere increases at constant
\( \mathrm{P} \) rate \( \left(\frac{\mathrm{dV}}{\mathrm{dt}}=4\right) \). If radius of the sphere is denoted

W by \( r \), then surface area of the sphere increases at the rate :-
(1) \( \frac{4}{r} \)
(2) \( \frac{8}{r} \)
(3) \( \frac{12}{r} \)
(4) \( \frac{16}{r} \)
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