question_answer

The condition for which the straight line \[y=mx+c\] touches the parabola \[{{y}^{2}}=4ax\] is        [MP PET 1997, 2001]

A)            \[a=c\]                                      

B)            \[\frac{a}{c}=m\]

C)            \[m={{a}^{2}}c\]                       

D)            \[m=a{{c}^{2}}\]