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The combined equation of the lines \( I_{1}, I_{2} \) is \( 2 x^{2}+6 x y+y^{2}=0 \) and that of the lines \( m_{1}, m_{2} \) is \( 4 x^{2}+ \) \( 18 x y+y^{2}=0 \). If the angle between \( I_{1} \) and \( m_{2} \) be \( \alpha \)
\( \mathrm{P} \)
(a) \( \frac{\pi}{2}-\alpha \)
(b) \( 2 \alpha \)
(c) \( \frac{\pi}{4}+\alpha \)
(d) \( \alpha \)
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