A linear function is shown on the graph.

A linear function beginning with open circle at negative 3 comma negative 5 and ending with an open circle at 3 comma 7.

What is the domain of the function?

{y | −5 ≤ y ≤ 7}
{y | −5 < y < 7}
{x | −3 ≤ x ≤ 3}
{x | −3 < x < 3}