If the equation \( a x^{2}+2 b x-3 c=0 \) has non real roots and \( \frac{3 c}{4}a+b \) then \( ...

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If the equation \( a x^{2}+2 b x-3 c=0 \) has non real roots and \( \frac{3 c}{4}a+b \) then \( c \) is always
\( (a)0 \)
(b) \( 0 \)
(c) \( \geq 0 \)
(d) zero
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