Tyson has a $50 gift card to use at a store . He does not have any additional money to spend at the store. Tyson will purchase a belt that costs $8 and x number of shirts that cost $15 each. The function f(x) = 42 - 15x models the balance on the gift card after Tyson makes the purchases. What is the most appropriate domain of the function? A. all integer values of x
B. all positive integer values of x
C. 0 ≤ x ≤ 2 where x is an integer
D.0 ≤ x ≤ 3 where x is an integer