Consider the following program. 1. k := i + j 2. x := k * 10 3. if x > z goto line 7 4. x := 2 - Y 5. f := x * j 6. goto line 10 7. x := y + 1 8. i := j 9. j := j + 2 10. y := f * 2 11. a := x + y 12. if x = 0 goto line 7 Assuming only variable "a" is live on exit, and that no register spilling is allowed, which of the following pairs of variables could potentially be assigned to the same register? [Choose all that apply] O kandi fand x Oz and x y andj