Which of the following storage device uses SRAM or DRAM?

USB flash drives primarily use NAND flash memory but typically do not include separate SRAM or DRAM for caching in the same way an SSD does.

Solid-state drives (SSDs) primarily use NAND flash memory for data storage, but they commonly include DRAM (Dynamic Random-Access Memory) to function as a cache, significantly improving read and write speeds by buffering data. Some SSD controllers might also use a small amount of SRAM for internal operations.

Blu-ray Discs are optical storage media that store data magnetically or optically, not using SRAM or DRAM for data storage.

A CD drive is an optical drive that reads data from Compact Discs, which are optical storage media, not using SRAM or DRAM for data storage.