The correct answer is: E. All of the above
A keyboard is an input device that allows a user to input text into a computer or other electronic device. It is typically made up of a set of keys, each of which corresponds to a different character or symbol. When a key is pressed, it sends a signal to the computer, which then displays the corresponding character or symbol on the screen.
Keyboards are used in a variety of devices, including desktop computers, laptops, tablets, and smartphones. They are also used in some specialized devices, such as point-of-sale terminals and financial transaction terminals.
Desktop terminals are computers that are typically used in offices or other work environments. They are often used for tasks such as word processing, spreadsheets, and presentations.
Point-of-sale terminals are used in retail stores to process customer payments. They typically have a keyboard, a display screen, and a cash drawer.
Financial transaction terminals are used in banks and other financial institutions to process customer transactions. They typically have a keyboard, a display screen, and a card reader.
Executive workstations are high-end computers that are used by executives and other high-level professionals. They typically have a powerful processor, a large amount of memory, and a high-resolution display.
All of these devices use a keyboard for input.