Watermelons are on sale for $3 each, but customers can buy no more than 4 at this price.
For watermelons bought at the sale price, the total cost, y, is directly proportional to the number bought, X .This function can be modeled by y=3x.
What is the domain of the function in this situation?
OA. Al positive numbers, x >0
OB. (0, 3, 6, 9, 12}
Oc. (0, 1, 2,3, )
O D. 0, 1, 2, 3, 4}