Find the domain of the following function. X - 2 f(x,y) = cos 5 Select the correct choice below and fill in any answer boxes within your choice. O A. {(x,y): X # (Use a comma to separate answers as needed.) O B. {(x,y ): x # and y * (Use a comma to separate answers as needed.) O C. (x,y): y * (Use a comma to separate answers as needed.) O D. R2