Which of the following is a type of optical storage media?

Optical storage media refer to technologies that use lasers to read and write data on disc formats, primarily storing data in a format that can be accessed by optical devices. A CD, or Compact Disc, is a classic example of this type of media. It utilizes a laser to read and write data that is physically etched onto its surface in the form of microscopic pits and lands.

In contrast, the other options represent different types of storage media. USB Flash Drives and SSDs (Solid State Drives) use flash memory technology, which stores data electronically in solid-state memory, rather than using light to read and write data like optical media does. Meanwhile, HDDs (Hard Disk Drives) consist of spinning magnetic disks where data is written magnetically. Therefore, CD is the only option listed that qualifies as optical storage media, making it the correct answer.