The equation of the tangent to the curve...

The equation of the tangent to the curve `sqrt( (x)/( a)) + sqrt((y)/( b)) = 1` at the point `(x_1, y_1)` is `(x)/( sqrt(ax_1) ) + (y)/( sqrt(by_1) )=k`. Then, then value of `k` is
a)2 b)1 c)3 d)7

A

2

B

1

C

3

D

7

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The correct Answer is:

B

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