The graph of a function is shown:

scatter plot of the points negative 5, 4 and negative 2, negative 1 and negative 1, 3 and 4, negative 3

Which of the following correctly identifies the set of outputs?

{–3, –1, 3, 4}
{–5, –2, –1, 4}
{(–5, 4), (–2, –1), (–1, 3), (4, –3)}
{(4, –5), (–1, –2), (3, –1), (4, –3)}