Step: 1
A relation is a function if every input has exactly one output.
Step: 2
In the plot, for each x-coordinate, there is only one y-coordinate.
Step: 3
So, the relation is a function.
Step: 4
The domain is 1, 2, 3, and 6 and the range is 2, 3, 4, and 6.
Correct Answer is : It is a function, domain: 1, 2, 3, and 6; range: 2, 3, 4, and 6.