Answer the following question: Read the following article and select the best answer. Article: Standing in line for the latest iPhone at the Apple store, queuing for tickets to Wimbledon or even just waiting at the post office might just have got a lot easier. Japanese car-maker Nissan announces that it has just the thing to relieve the painful legs of tired queuers. The new system of 'self-driving' chairs is designed to detect when someone at the front of the queue is called, and automatically move everyone else one step forward in line. The new invention is shown off in a company video, which shows a busy restaurant with patrons waiting outside. In the video, diners are sitting in a row of chairs, but will not have to stand when the next hungry diner is called to a table. Instead, the chairs, equipped with autonomous technology that detects the seat ahead, move along a path toward the front of the line. When the person at the front of the queue is called, the empty chair at the front can sense it is empty and so moves out of pole position. Cameras on the remaining chairs then sense the movement and follow automatically. The system, which is similar to the kind used in Nissan's autonomous vehicle technology, will be tested at select restaurants in Japan this year, Nissan said. "It appeals to anyone who has queued for hours outside a crowded restaurant: it _ the boredom and physical pain of standing in line," Nissan added. Although Tokyo has some 160,000 restaurants, long queues are not uncommon. Chosen restaurants that meet the criteria will be able to show the chairs outside their restaurant next year. Nissan also released a short video showing the chairs being used in an art gallery, moving slowly in front of the various paintings to let viewers appreciate the art without the need to stand up. Question: What can we know about "self-driving" chairs from the text? - They are in hot demand like iPhones. - They are intended for queuing diners. - They are the inventions of a car company. - They are completely different from vehicle technology.
Answer:
They are the inventions of a car company.