The graph represents y as a function of x . Which additional point can be plotted so that the graph continues to represent y as a function of x ?

Answer:
I think it's the last one D
Step-by-step explanation:
I'm not 100% sure, but I think the x can't repeat and 4 is the only number of x that hasn't been plotted yet. Tell me if it was right?
Answer:
It is d because it the only one that dont have a output
Step-by-step explanation:
Trust me I did this on a test too