If \( y+b=m_{1}(x+a) \) and \( y+b=m_{2}(x+a) \) are two \( \mathrm...

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If \( y+b=m_{1}(x+a) \) and \( y+b=m_{2}(x+a) \) are two
\( \mathrm{P} \) tangents to the parabola \( y^{2}=4 a x \), then:

W
(1) \( m_{1}+m_{2}=0 \)
(2) \( m_{1} m_{2}=1 \)
(3) \( m_{1} m_{2}=-1 \)
(4) \( m_{1}=m_{2} \)
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