Let the foci of the ellipse (x^(2))/(9)+...

Let the foci of the ellipse `(x^(2))/(9)+y^(2)=1` subtend a right angle at a point P. then the locus of P is

A

`x^(2)+y^(2)=1`

B

`x^(2)+y^(2)=2`

C

`x^(2)+y^(2)=4`

D

`x^(2)+y^(2)=8`

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