If \( (a, 0) \) is a point on a diameter of the circle \( x^{2}+y^{...

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If \( (a, 0) \) is a point on a diameter of the circle \( x^{2}+y^{2}=4 \), then \( x^{2}-4 x-a^{2}=0 \) has
(a) exactly one real root in \( (-2,-1] \)
\( \mathrm{P} \)
(b) exactly one real root in \( [2,5] \)
W
(c) distinct roots greater than 1
(d) distinct roots less than-1
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