QUESTION $15-1$ POINT

What is the standard form of the equation of the parabola with the focus $(2,-1)$ and the directrix $y=3?$

Select the correct answer below:

$(y-3{)}^2-6(x-\frac{1}{2})$

$(y1{)}^2=-2(x-\frac{5}{2})$

$(x-2{)}^2=-8(y-1)$

$(x-2{)}^2=8(y-1)$