If \( \mathrm{b}^{2}2 \mathrm{ac} \), then equation \( \mathrm{ax}^...

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If \( \mathrm{b}^{2}2 \mathrm{ac} \), then equation \( \mathrm{ax}^{3}+b \mathrm{x}^{2}+\mathrm{cx}+\mathrm{d}=0 \) has
(a) exactly one real roots
PV
(b) Has three real roots
(c) at least two roots
(d) None of these
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