The graph below shows a relationship between x and y. Which of the following statements about the graph are true?

Select all that apply.

There is a relative maximum at x = 1.
There is a relative minimum at x = 3.
There is a relative maximum at x = 4.
There is a relative maximum at x = 5.
There is a relative minimum at x = 6.
There is a relative minimum at x = 7.