Which set of ordered pairs represents a function? A
{(2,7),(2,8),(3,8)}\left\{\left(2,7 \right),\left(2,8\right),\left(3,8\ right)\right\}{(2,7),(2,8),(3,8)}
B
{(3,2),(3,3),(3,4)}\left\{\left(3,2 \right),\left(3,3\right),\left(3,4\ right)\right\}{(3,2),(3,3),(3,4)}
C
{(4,1),(5,1),(4,4)}\left\{\left(4,1 \right),\left(5,1\right),\left(4,4\ right)\right\}{(4,1),(5,1),(4,4)}
D
{(5,6),(8,6),(9,6)}\left\{\left(5,6 \right),\left(8,6\right),\left(9,6\ right)\right\}{(5,6),(8,6),(9,6)}