The correct answer is A. Teletext.
Teletext is a broadcast television service that provides text and graphics, usually alongside a television program. It is transmitted using the vertical blanking interval of the television signal, which is the time between the end of one line of video and the start of the next. This means that teletext can be received on any television set, without the need for any additional equipment.
Teletext was first developed in the United Kingdom in the early 1970s, and it was soon adopted by other countries around the world. It was originally used to provide news, weather, and other information, but it has since been used for a variety of other purposes, including education, entertainment, and shopping.
Teletext is a relatively low-bandwidth service, which means that it can be transmitted over a relatively narrow band of frequencies. This makes it ideal for use in areas where there is limited bandwidth, such as rural areas.
Teletext is a valuable service that provides a range of information and services to people around the world. It is a low-cost, low-bandwidth service that is easy to use and can be received on any television set.
Here is a brief explanation of each option:
- A. Teletext: Teletext is a broadcast television service that provides text and graphics, usually alongside a television program. It is transmitted using the vertical blanking interval of the television signal, which is the time between the end of one line of video and the start of the next. This means that teletext can be received on any television set, without the need for any additional equipment.
- B. Network: A network is a group of computers that are connected together so that they can share information and resources. Networks can be local, meaning that they are located in a single building or area, or they can be wide area, meaning that they are located in different parts of the world.
- C. Telematique: Telematique is a term used to describe the use of telecommunications to provide information and services. It is a combination of the words “telecommunications” and “informatique”, which is the French word for “information technology”.
- D. Video text: Video text is a service that provides text and graphics on a television screen. It is similar to teletext, but it uses a different technology. Video text is usually transmitted using a dedicated channel, rather than being transmitted alongside a television program.
- E. None of the above: None of the above options are correct. The correct answer is A. Teletext.