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P is any point on the hyperbola `x^(2)-y^(2)=a^(2)`. If `F_1 and F_2` are the foci of the hyperbola and `PF_1*PF_2=lambda(OP)^(2)`. Where O is the origin, then `lambda` is equal to

A

`1`

B

`sqrt(2)`

C

`2`

D

`3`

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  15. If x^2/a^2+y^2/b^2=1(a>b) and x^2-y^2=c^2 cut at right angles, then:

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