Which of the following contains a laser?

A laser is used in devices that read data optically, such as CD drives. In a CD drive, a laser beam is directed at the disc surface. The laser reflects off the pits and lands on the disc, which are interpreted as binary data (0s and 1s). This optical reading process requires a laser. RAM (Random Access Memory) is a type of volatile memory that stores data electronically using transistors. It does not use any optical components, so no laser is involved. Hard Disk Drives (HDDs) store data magnetically on spinning platters. Data is read and written using a read/write head that moves over the disk surface. This process is mechanical and magnetic, not optical, so no laser is used. Therefore, only the CD drive contains a laser. The option stating 'More than one of the above' is incorrect because only one device uses a laser. The option 'None of the above' is also incorrect because a CD drive does contain a laser.