If in a \( \triangle A B C, A D, B E \) and \( C F \) are the altitudes and \( R \) is the circu...

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If in a \( \triangle A B C, A D, B E \) and \( C F \) are the altitudes and \( R \) is the circum-radius, then radius of the circumcircle \( D E F \) is
(A) \( \frac{R}{2} \)
(B) \( 2 R \)
(C) \( R \)
(D) \( \frac{3}{2} R \)
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