If \( 2\left(x^{2}+y^{2}\right)+4 \lambda x+\lambda^{2}=0 \) represents a circle of meaningful r...

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If \( 2\left(x^{2}+y^{2}\right)+4 \lambda x+\lambda^{2}=0 \) represents a circle of meaningful radius then the range of real values of \( \lambda \) is
(a) \( R \)
(b) \( (0,+\infty) \)
(c) \( (-\infty, 0) \)
(d) none of these
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