The function f(t) represents the cost to connect to the internet at an online gaming store. it is a function of t, the time in minutes spent on the internet.

which statement is true about the internet connection cost?

a. it costs $5 per hour to connect to the internet at the gaming store.
b. the first half hour is free, and then it costs $5 per minute to connect to the internet.
c. it costs $10 for each 90 minutes spent connected to the internet at the gaming store.
d. any amount of time over an hour and a half would cost $10.