A user needs a portable, low-cost storage solution that is small enough to carry in a pocket and has the largest capacity possible. Which of the following is the best solution for the user?

Flash drives (USB drives) are highly portable, typically inexpensive per gigabyte, small enough to fit in a pocket, and offer capacities ranging from gigabytes to several terabytes. Their widespread compatibility and ease of use make them ideal for these requirements.

DVD-R discs have limited capacity and are not as convenient for pocket carry or rewritable use.

M.2 drives are internal storage components, not designed for external portability.

Memory cards are portable but often require a separate card reader for use with computers and may not offer the same universal plug-and-play convenience or cost-effectiveness as flash drives at higher capacities.