Let \( \lambda \in R \), the origin and the non-real roots of \( 2 z^{2}+2 z+\lambda \) \( =0 \)...

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Let \( \lambda \in R \), the origin and the non-real roots of \( 2 z^{2}+2 z+\lambda \) \( =0 \) form the three vertices of an equilateral triangle in the Argand plane then \( \lambda \) is
(a) 1
(b) \( \frac{2}{3} \)
(c) 2
(d) -1
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