If the surface tension of a liquid is T, the gain in surface energy for an increase in liquid surface by A is

(a) ${\mathrm{AT}}^{-1}$                       (b) $\mathrm{AT}$

(c) ${\mathrm{A}}^{2}\mathrm{T}$                         (d) ${\mathrm{A}}^{2}{\mathrm{T}}^{2}$

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