Answer: Option D
An input device is a peripheral device used to provide data and control signals to a computer. There are two types of input devices - direct entry devices and indirect entry devices.
Direct entry input devices are devices that enable the user to enter data directly into the computer without any intermediate processing. Some examples of direct entry input devices include:

• Optical scanners: These are devices that scan printed text or images and convert them into digital data that can be used by the computer. Optical scanners are commonly used for document scanning, barcode scanning, and image scanning.
• Mice: A mouse is a pointing device used to input data and commands into a computer. It is used to move the cursor on the screen, select items, and navigate through menus and applications.
• Digitizers: A digitizer is a device that is used to capture hand-drawn images or handwritten text and convert them into digital data. Digitizers are commonly used in graphic design, animation, and other applications that require accurate and precise input.

Indirect entry input devices are devices that require the input data to be processed before it can be used by the computer. Some examples of indirect entry input devices include:

• Keyboards: A keyboard is a device that is used to input text and commands into a computer. It is the most common input device used for general-purpose computing.
• Touchscreens: A touchscreen is a device that allows the user to input data by touching the screen. It is commonly used in mobile devices and kiosks.

In summary, direct entry input devices enable the user to input data directly into the computer without any intermediate processing. Optical scanners, mice, and digitizers are all examples of direct entry input devices, while keyboards and touchscreens are examples of indirect entry input devices.