The figure shows two wedges and two blocks. Let acceleration of A and D are $a_{1}$ and $a_{4}$ wrt B and C respectively, and acceleration of B and C are $a_{2}$ and $a_{3}$ wrt ground respectively. The correct relation between these four vectors is :-

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If string moves with a ​ a − a 2 ​ = a 1 ​ ​ a − a 3 ​ = a 4 ​ ​

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