Jen makes custom checker sets by hand. For each set, she makes the board, and then makes the playing pieces to match. The table shows the relationship between the number of checkerboards, c, Jen makes and the total number of playing pieces she needs to make, p. Checkerboards (c) 1 2 3 4 Playing pieces (p) 24 48 72 96 Which of the variables is independent and which is dependent?