A car rental company charges a flat fee plus a per-day rate for renting a car. The table shows the total cost (in dollars) for renting a car for days.
| Days (D) | 1 | 3 | 5 |
|---|---|---|---|
| Cost (C) | 35 | 75 | 115 |
Which of the following best describes the meaning of the slope of the linear relationship between and ?
The initial flat fee for renting the car.
The total cost for 0 days of rental.
The additional cost for each day the car is rented.
The maximum number of days the car can be rented.
