All hotels do not serve the same clientele. In fact, it is possible to place hotels in four broad categories. The first is the commercial hotel, which provides services essentially for transients, many of them traveling on business. Many city hotels and diversely located motels fall into this group. The second category is resort hotels. Located in vacation areas, they often provide recreational facilities of their own as well. A third type of hotel aims its services largely at the convention trade, which refers to meetings, held regularly or irregularly, of various business or professional groups. At present, it has become trendy for resort hotels to attract this kind of business. The fourth category is resident hotels. People who do not wish to keep house themselves can rent accommodations on a seasonal basis or even permanently in many hotels. Not firm distinction exists between the different kinds of hotels. In large cities that are also tourist centers, one hotel may offer all types of service. Choose from the following choices those that can help build the information structure of the paragraph. ( )
A、commercial
B、resort
C、convention trade
D、resident