Question $5($Mandatory$)(2$ points$)$ Retake question COULD BE TRUE.

Every $y$ value $($output$)$ is associated with many $C$ values $($input$)$

Every $C$ value $($input$)$ is associated with many $y$ values $($output$)$

Every $y$ value $($output$)$ is associated with exactly one $x$ value $($input$)$

Every $x$ value $($input$)$ is associated with exactly one $y$ value $($output$)$