The correct answer is Compact Disc - Recordable; once.CD-R Stands for Compact Disc “ Recordable and it is a digital optical disc storage format.A CD-R disc is a compact disc that can be written once and read arbitrarily many times.The word "recordable" is used because CD-Rs are often used to record audio, which can be played back by most CD players.However, many other kinds of data can also be written to a CD-R, so the discs are also referred to as "writable CDs."The data burned onto a CD-R disc is permanent, meaning it can not be altered or erased like the data on a hard drive.Additional Information The "ROM" part in CD-ROM means the data on the disc is "read-only," or cannot be altered or erased. Because of this feature and its large capacity, CD-ROMs are a great media format for retail software.Binary (Digital) data that is encoded on little pits on the optical disc are read by the laser beams which are situated in the Optical Reader. It is an Optical Disc that has the capacity to store Data, Music Files, Videos Files, Games, etc.CD-ROM is made up of clear polycarbonate plastic, coated with reflective material and a protective coat of clear lacquer.CD-ROM can hold up to 700 Megabytes of data, roughly 3,00,000 typewritten pages.