The acceleration due to gravity is measured on the surface of earth by using a simple pendulum. If $\alpha$ and $\beta$ are relative errors in the measurement of length and time period respectively, then percentage error in the measurement of acceleration due to gravity is ................ 

  • A

    $\left(\alpha+\frac{1}{2} \beta\right) \times 100$

  • B

    $(\alpha-2 \beta)$

  • C

    $(2 \alpha+\beta) \times 100$

  • D

    $(\alpha+2 \beta) \times 100$

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