4. The graph below shows y = b(x). Which statement BEST describes the graph?

O The graph shows a function because it has an x-intercept
and a y-intercept.
O The graph does not show a function because the range of
the graph is not all real numbers.
O The graph shows a function because each element of the
domain is assigned to exactly one element of the range.
O The graph does not show a function because many
elements of the domain are assigned to the same element
of the range.