Shen is interested in joining a health and fitness club. There are four clubs in his arca. The functions C, (r) = 25t + 50, C,(r) = 30t + 25, C,(t) - 50г, and C,*) - 35t + 10 model the cost C, in dollars, of being a member for time f, in months, at each of the four clubs. Which club charges the greatest joining fee?
a. Club 1 with cost C, (t)
b. Club 2 with cost Cz(*)
c. Club 3 with cost C,(1)
d. Club 4 with cost C,(f)