In the system shown in the figure, the acceleration of the \( 1 \ma...

In the system shown in the figure, the acceleration of the \( 1 \mathrm{~kg} \) mass and the tension in the string connecting between \( A \) and \( B \) is :
(A) \( \frac{\mathrm{g}}{4} \) downwards, \( \frac{8 \mathrm{~g}}{7} \)
(B) \( \frac{\mathrm{g}}{4} \) upwards, \( \frac{\mathrm{g}}{7} \)
(C) \( \frac{\mathrm{g}}{7} \) downwards, \( \frac{6}{7} \mathrm{~g} \)
(D) \( \frac{\mathrm{g}}{2} \) upwards, \( \mathrm{g} \)