Which storage option is least likely to degrade over time?

Flash memory is the least likely to degrade over time due to its solid-state nature. Unlike magnetic storage, which can suffer from magnetic field fluctuations that can lead to data loss, flash memory stores data in memory cells that require no moving parts. This lack of mechanical elements means flash memory is much more resilient to physical wear and environmental factors.

In comparison, optical storage, such as CDs and DVDs, may degrade due to scratches or exposure to light and heat, which can make the data unreadable. Hard drives, which use spinning disks, can also suffer from mechanical failures and are vulnerable to physical shock and wear over time. Therefore, flash memory provides a more reliable solution for long-term data retention as it is less susceptible to the common forms of data degradation that affect other storage mediums.