Which of the following statements are true from the graph f(x)= (x+5)(x-3)? choose all that apply: a. the graph has a relative maximum b. the graph has a relative minimum c. the graph has an x-intercept at (5,0) d. the graph has an x-intercept at (3,0) e. the graph has an y-intercept at (0,-15) f. the axis of symmetry is x=-2