At what points of R is the following function continuous? 2 2 f(x,y) = 7x + 4y ... Select the correct choice and, if necessary, fill in the answer box to complete your choice. A. All points except the point(s) (Type an ordered pair. Simplify your answer. Use a comma to separate answers as needed.) B. All points except the points that are above y= (Simplify your answer.) OC. All points except the points that are on the line(s) y = (Simplify your answer. Use a comma to separate answers as needed.) (Simplify your answer.) O D. All points except the points that are below y = E. All points in R