Select all of the graphs which represent y as a function of x. 5- O O unt 5 -4 -3 -2 -1 1 2 3 4 urt -5 -B 1 2 3 0 O urt NO- -5 1 -3 - 2 -1 N 3 4 3 ur- -5 -3 2 -1 4 O O -5 -4 -3 -2 -1 1 4 4 urt -5 -4 -3 -2 -1 1 3 4 unt