A) $ g=f $
B) $ g^{2}=c $
C) $ f^{2}=c $
D) $ g^{2}+f^{2}=c $
Correct Answer: B
Touches x-axis,
Hence radius = ordinate of centre.
Hence $ \sqrt{g^{2}+f^{2}-c}=(-f) $ or $ g^{2}=c $ .
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