Optical discs are ideal storage medium. They are most useful for reading large block of sequential data.Such data can be both audio or video data. They can do this due to _______.

• A. Compact size and light weight
• B. Absence of mechanical read/ write head
• C. Presence of single spiral track, when reading or writing data there is no need to stop the flow of data to switch tracks.
• D. Less loss per bit of storage