For the equation \( x^{2}+y^{2}+2 \lambda x+4=0 \) which of the fol...

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For the equation \( x^{2}+y^{2}+2 \lambda x+4=0 \) which of the following can be true ?
\( \mathrm{P} \)
(a) It represents a real circle for all \( \lambda \in R \).
(b) It represents a real circle for \( |\lambda|2 \)
(c) The radical axis of any two circles of the family is the y-axis
(d) The radical axis of any two circles of the family is the x-axis.
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