D Question 2 4 pts What is the domain of the following multivariate function? f(x, y) = Vy -x O {r ER | x 2 0}, that is all real numbers, R, bigger than or equal to 0. O {(x, y) ( R2 | y 2 x}, that is all points in the plane, R', above (in the y-direction) and including the line y = I. O {(x, y) ER' | y > -x }, that is all points in the plane, R, above (in the y-direction) but not including the line y = -I. O {(x, y) ER' | y