If tangent to the curve \( x=a^{2}, y=2 a \) is perpendicular to \(...

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If tangent to the curve \( x=a^{2}, y=2 a \) is perpendicular to \( x \)-axis then its point of contact is
\( \mathrm{P} \)
(A) \( (a, a) \)
(B) \( (0, a) \)
(C) \( (a, 0) \)
(D) \( (0,0) \)
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