The tangent at any point \( P \) of the circle \( x^{2}+y^{2}=16 \) meets the tangent at a fixed...

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The tangent at any point \( P \) of the circle \( x^{2}+y^{2}=16 \) meets the tangent at a fixed point \( A \) at \( T \). Point \( T \) is joined to \( B \), the other end of the diameter, through \( A \).
The sum of focal distances of any point on the curve is
(1) 12
(2) 16
(3) 20
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