The correct answer is: A. Magnetic card.
A magnetic card is a thin, rectangular piece of plastic or paper that has been coated with a magnetic material. Data is stored on the card by magnetizing tiny areas on the surface of the card. Magnetic cards are used in a variety of applications, including credit cards, debit cards, and access cards.
A magnetic tape is a long, thin strip of plastic that has been coated with a magnetic material. Data is stored on the tape by magnetizing tiny areas on the surface of the tape. Magnetic tapes are used in a variety of applications, including data backup, archiving, and audio recording.
A punched card is a piece of stiff paper with rectangular holes punched into it. Data is stored on the card by punching holes in specific locations on the card. Punched cards were once widely used in data processing, but they have been largely replaced by other technologies, such as magnetic tape and magnetic disks.
An optical mark reader (OMR) is a device that reads marks made on a piece of paper. OMRs are often used to scan answer sheets on multiple-choice tests.
Therefore, the correct answer is A. Magnetic card.