What is the range of the following relation?

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

{-1, -2, -3, -4, -5}
{1, 2, 3, 4, 5}
{-1, -2, -3, -4, -5, 1, 2, 3, 4, 5}