Tomas bought 3 software apps and 2 e-books for a total of $21. The two e-books cost $12. If s represents the cost of each app, the total cost of all 5 items is represented by 3 s 12 = 21. Which statement about verifying the solution for s is true? The solution is given by s = 6 because it makes the value of 3 s 12 equal to 21. The solution is given by s = 3 because it makes the value of 3 s 12 equal to 21. The solution is given by s = 9 because it makes the value of 3 s 12 equal to 21. The solution is given by s = 12 because it makes the value of 3 s 12 equal to 21.