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Consider two physical quantities `A` and `B` related to each other as `E=(B-x^(2))/(At)` where `E,x` and `t` have dimensions of energy,length and time respectively.The dimension of `AB` is :

A

`L^(2)M^(-1)T^(1)`

B

`L^(-2)M^(1)T^(0)`

C

`L^(-2)M^(-1)T^(1)`

D

`L^(0)M^(-1)T^(1)`

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