The excess of pressure inside a soap bubble than that of the outer pressure is

(a) $\frac{2\mathrm{T}}{\mathrm{r}}$                       (b) $\frac{4\mathrm{T}}{\mathrm{r}}$

(c) $\frac{\mathrm{T}}{2\mathrm{r}}$                         (d) $\frac{\mathrm{T}}{\mathrm{r}}$

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