The line among the following that touches the parabola `y^2=4ax` is

The line among the following, that touches the parabola y^(2)=4 a x is

Find the condition that the line x cos alpha+y sin alpha=p touches the parabola y^(2)=4ax

The locus of the mid points of the line joining the focus and any point on the parabola y^(2)=4ax is a parabola with equation of directrix as

The locus of the midpoints of the line joining the focus and any point on the parabola y^(2)=4ax is a parabola with the equation of directrix as

If the line y=mx+c touches the parabola y^(2)=4a(x+a) , then

If the line y=mx+c touches the parabola y^(2)=4a(x+a) , then

If the line y=mx+c touches the parabola y^(2)=4a(x+a) , then