The correct answer is: Keyboard
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 that correspond to letters, numbers, and symbols. When a key is pressed, it sends a signal to the computer, which then displays the corresponding character on the screen.
A magnetic storage device is a type of data storage device that uses magnetic fields to store and retrieve data. Magnetic storage devices are typically used to store large amounts of data, such as computer files, music, and videos.
A diskette is a type of magnetic storage device that is typically used to store computer files. Diskettes are small, portable, and relatively inexpensive. However, they have a limited storage capacity and are not as reliable as other types of storage devices, such as hard disks.
A hard disk is a type of magnetic storage device that is typically used to store large amounts of data, such as computer files, music, and videos. Hard disks are internal storage devices that are installed inside a computer. They are more reliable and have a higher storage capacity than diskettes.
Therefore, the keyboard is the only option that is not used in the storage phase of a computer-based information system.