Observe the figure at the right. The number of squares that make up the figures is a function of the indicated figure number. Which of the following statements is true? A. The domain of the function is the number of squares. B. The range of the function is the figure’s number. C. The domain is the set {1, 2, 3} while range is the set {1, 4, 9}. D. The domain is the set {1, 2, 3, …} while the range is the set {1, 4, 9, …}.​