What is the domain of the relation graph below?

Look at the picture.
Domain: -4 ≤ x ≤ 4
Range: -1 ≤ y ≤ 1
The domain would be: -4 ≤ x ≤ 4
The range would be: -1 ≤ y ≤ 1
And that would make the answer to the question: {x | -4 ≤ x ≤ 4}.