If \( \lambda x^{2}+10 x y+3 y^{2}-15 x-21 y+18=0 \) represents a p...

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If \( \lambda x^{2}+10 x y+3 y^{2}-15 x-21 y+18=0 \) represents a pair of straight lines. Then, the value of \( \lambda \) is
\( \mathrm{P} \)
(a) -3
(b) 3
(c) 4
(d) -4
W.
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