Shanghai: Car rentals  are becoming more and more popular as an inexpensive way of taking to roads. Business people, foreign and families alike are making good use of the growing industry. The first car rental firm opened in Shanghai in 1992 an dnow 12 car rental players are in the game, with more than 11,500 cars in their books. The largest player-Shangha Bashi Tourism Car Rental Center offers a wide variety of choices-deluxe sedans, minivans, station wagons, coaches. Santana sedans are the big favorite. Firms can attract enough customers for 70 percent of their cars every month. This fighure shoots up during holiday seasons like National Day, Labor Day and New Year's Day, with some recording 100 percent rental. The major market force rests in the growing population of white-collar employees  , who can afford the new service, said Zhuang Yu, marketing manager of Shanghai Angel Car Rental Co. Which of the following statements is true according to the text?
70% of the cars can be rented out on holiday. 70% of the customers are white-collar employees. More firms are open for service during holiday seasons. Some firms rent out all their cars during holiday seasons.