2 points What is an equation of a circle whose center is at (2,-4) and is tangent to the line x = -2? 1)(x-2)+(y+ 4)=42) (x+2)+(y-4) = 16 3) (x + 2)+(y-4)=4 4) (x-2)+(y+4)-16 O 1 2 3 O 4