please help this is on a quiz

Which statement is true about the given set of data?

{(4, 0), (5, 0), (8, 0), (11, 0)}

{4, 5, 8, 11} are functions.
{4, 5, 8, 11} are the range.
{4, 5, 8, 11} are the outputs.
{4, 5, 8, 11} are the domain.