The correct answer is Universal Serial Bus.The full form of USB is Universal Serial Bus.USB is a plug and play interface that allows a computer to communicate with external and other devices.The first commercial release of the Universal Serial Bus (version 1.0) was in January 1996.USB Pendrive is a Secondary type of storage device.USB connectors come in different shapes and sizes. They are of various types which include the standard USB, Mini USB, and Micro USB, have two or more variations of connectors.Additional Information A primary storage device is a storage medium that holds a memory for short periods of time while a computer is running.Random-access memory (RAM) and cache are both examples of a primary storage device.Tertiary storage devices comprise high-capacity data archives designed to include vast numbers of removable media, such as tapes or optical discs.