Let S be the set of all the natural numb...

Let S be the set of all the natural numbers, for which the line `(x)/(a)+(y)/(b)=2` is a tangent to the curve `((x)/(a))^(n)+((y)/(b))^(n)=2` at the point (a, b) `abne0`. Then :

A

`S=phi`

B

`n(S)=1`

C

`S={2k : k in N}`

D

`S=N`

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