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 \( A \).
Which of the following does not change by changing the radius of the circle?
(1) Coordinates of foci
(2) Length of the major axis
(3) Eccentricity
(4) Length of the minor axis
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