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[" If the lines "(y-b)=m(1)(x+a)" and "(...

[" If the lines "(y-b)=m_(1)(x+a)" and "(y-b)=m_(2)(x+a)" are the tangents to the parabola "y^(2)=4ax" ,then "],[[" (A) "m_(1)+m_(2)=0," (B) "m_(1)m_(2)=1," (C) "m_(1)m_(2)=-1," (D) "m_(1)+m_(2)=1]]

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