For his mobile phone service, John pays a monthly fee of $40 plus $15 for each 1 GB of data (rounded up) over his 8 GB of data that comes with his plan. For his monthly charge before taxes to be at most $70, how many gigabytes of data can he use in a month? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer.a John can use at least 2 GB of additional data.b John can use no more than 2 GB of additional data.C John can use less than 2 GB of additional data.d John can use more than 2 GB of additional data.