Length of the shortest normal chord of the parabola \( y^{2}=4 a x \) is (A) \( a \sqrt{27} \) (...

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Length of the shortest normal chord of the parabola \( y^{2}=4 a x \) is
(A) \( a \sqrt{27} \)
(B) \( \quad 3 a \sqrt{3} \)
\( \mathrm{P} \)
(C) \( 2 a \sqrt{27} \)
(D) None of these
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