What is the range of the function represented by these ordered pairs?

{(–2, 1), (0, 0), (3, –1), (–1, 7), (5, 7)}
{–2, –1, 0, 3, 5}
{–1, 0, 1, 7}
{–2, –1, 0, 1, 3, 5, 7}
{0, 1, 7}