Which of the sets shown include the elements of Set Z that are both even numbers and multiples of 3? Z = {–12, –10, –9, –1, 3, 6, 8, 15} A. {6} B. {–12, 6} C. {–12, –9, 3, 6, 15} D. {–12, –10, –9, –1, 3, 6, 8, 15}