Does the table describe $x$ as a function of $y?$

Does the table describe $x$ as a function of $y?$

A$.$ Yes, each output $y$ is assigned to exactly one input $x.$

B$.$ Yes, exactly one output $x$ is assigned to each input $y.$

C$.$ No$,$ more than one output value $x$ is assigned to the input $y-$value

D$.$ No$,$ more than one output value $y$ is assigned to the input $x-$value

$\backslash$table$[[x,y$