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­­A man measures the period of a simple pendulum inside a stationary lift and finds it to be T sec. If the lift accelerates upwards with an acceleration $\mathrm{g}}{4}$ , then the period of the pendulum will be

(a) T

(b) $\frac{\mathrm{T}}{4}$

(c) $\frac{2\mathrm{T}}{\sqrt{5}}$

(d) $2\mathrm{T}\sqrt{5}$