Don't let the wording confuse you! You are looking for the option that is NOT described as non-volatile. Non-volatile memory retains data without a power source. Flash memory (like in thumb drives), SSD hard drives and tape drives do not require a power source to retain data. Random Access Memory (RAM) is volatile and loses its data without a power source and is therefore not described as non-volatile.
Non-volatile memory (NVM) or non-volatile storage is a type of computer memory that can retrieve stored information even after having been power cycled In contrast, volatile memory needs constant power in order to retain data Examples of non-volatile memory include flash memory, read-only memory (ROM), ferroelectric RAM, most types of magnetic computer storage devices (eg hard disk drives, floppy disks, and magnetic tape), optical discs, and early computer storage methods such as paper tape and punched cardsNon-volatile memory typically refers to storage in semiconductor memory chips, which store data in floating-gate memory cells consisting of floating-gate MOSFETs (metal-oxide-semiconductor field-effect transistors), including flash memory storage such as NAND flash and solid-state drives (SSD), and ROM chips such as EPROM (erasable programmable ROM) and EEPROM (electrically erasable programmable ROM)