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If the coefficient of x^(7) in (ax ^(2)...

If the coefficient of `x^(7) ` in `(ax ^(2) +(1)/(bx)) ^(11)` equals the corfficient of `x^(-7) ` in `(ax- (1)/(bx^(2)))^(11),` then a and b satisfy the equation-

A

`a=b`

B

`ab=1`

C

`a-b=1`

D

`a+b=1`

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The correct Answer is:
B
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