The correct answer is: A. Magnetic drum.
A magnetic drum is a type of primary storage device that uses a rotating drum coated with magnetic material to store data. Data is stored on the drum in the form of magnetized spots, which can be read and written by read/write heads. Magnetic drums are a type of direct-access storage device (DASD), which means that data can be accessed directly without having to search through a linear sequence of data. This makes magnetic drums a fast and efficient storage medium.
PROM (programmable read-only memory) is a type of non-volatile memory that can be programmed once and then read many times. PROM is used to store firmware, which is the software that controls the hardware of a device. PROM is not a primary storage device because it cannot be erased and rewritten.
Floppy disk is a type of magnetic storage medium that
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