The graph of a function is shown:

(scatterplot of the following points: negative 2 and 5, negative 1 and 1, 2 and negative 2, and 5 and 2)

Which of the following correctly identifies the set of outputs?

{(5, –2), (1, –1), (–2, 2), (2, 5)}

{(–2, 5), (–1, 1), (2, –2), (5, 2)}

{–2, –1, 2, 5}

{–2, 1, 2, 5}