Computer memory is any physical device, used to store data, information, or instruction temporarily or permanently. It is the collection of storage units that stores binary information in the form of bits. DVD, CD-Rom, And Bluray are types of secondary memory or are permanent storage spaces to hold a large amount of data. Blu RayIt is an Optical disc storage device used to store a large amount of data or high definition of video recording and playing other media files. It uses laser technology to read the stored data of the Blu-ray Disk. It can store more data at a greater density as compared to CD/ DVD. A sony Bluray disc can have up to 50GB of storage capacityDVDIt is an optical disc storage deviceIt stands for Digital Video Display or Digital Versatile Disc. It has the same size as a CD but can store a larger amount of data than a compact disc. The storing capacity of data in DVD varies from 4. 7 GB to 17 GBCD-ROM (Compact Disc Read-Only Memory): It is mainly used for bulk size mass like audio CDs, software, and computer games at the time of manufactureA CD-ROM holds a maximum of 650MB or 700MB of dataTherefore Blu-ray has the maximum storage capacity followed by the DVD, and then CD-ROM. Hence the correct answer is C, A, B