A skate shop rents roller skates as shown in the table below. Roller Skate Rentals Time Cost up to 60 minutes $5 up to 2 hours $10 up to 5 hours $20 daily $25 Which graph and function model this situation, where c is the cost, in dollars, of renting skates, and t is the number of hours in a single day that the skates are rented?