Find the equation of the directrix of the parabola defined by x2−4x+8y−4=0x^2 - 4x + 8y - 4 = 0x2−4x+8y−4=0.
y=0y = 0y=0
y=1y = 1y=1
y=2y = 2y=2
y=3y = 3y=3