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BeeTheMeme
I would say all real numbers as the domain for this would be (-∞,∞).

However, I may be wrong, math is not my strong suit.
The domain refers to the x-values. As we can see in the graph, the line stretches across on both sides infinitely. That means that the x values will go on forever, both on the positive side and the negative side, signifying that your answer is the first choice.