Let \( a, b \) and cbe real numbers such that \( 4 a+2 b+c=0 \) and \( a b0 \). Then, the equati...

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Let \( a, b \) and cbe real numbers such that \( 4 a+2 b+c=0 \) and \( a b0 \). Then, the equation \( x^{2}+b x+c=0 \) has
(A) real roots
(B) complex roots
(C) exactly one root
(D) none of these
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