What is the domain of the relation?

{(3, –5), (–2, 7), (–2, 4), (1, 8)}

(1 point)
Responses

{–5, –2, 1, 2, 4, 7, 8}
{–5, –2, 1, 2, 4, 7, 8}

{–2, 1, 3}
{–2, 1, 3}

{–5, 4, 7, 8}
{–5, 4, 7, 8}

There is no domain

{3, -2, 1}