Final answer:
A USB flash drive is a type of storage device used to save, transfer, and back up data. It is non-volatile, allowing it to retain information without power, distinguishing it from RAM and ROM.
Step-by-step explanation:
A USB flash drive is an example of b. Storage. USB flash drives are portable storage devices that are used for storing, transferring, and backing up digital data. They interface with computers and other devices via a USB port. Flash drives are a type of non-volatile storage, meaning they retain data without the need for a power supply, unlike RAM, which is volatile and requires power to maintain the information it stores. Unlike ROM, which typically contains firmware that is read-only or infrequently written to, USB flash drives are designed for the frequent addition and retrieval of data.