The correct answer is EPROM.EPROMAn EPROM (rarely EROM), or erasable programmable read-only memory, is a type of programmable read-only memory (PROM) chip that retains its data when its power supply is switched off.Computer memory that can retrieve stored data after a power supply has been turned off and back on is called non-volatile.It is an array of floating-gate transistors individually programmed by an electronic device that supplies higher voltages than those normally used in digital circuits.Once programmed, an EPROM can be erased by exposing it to a strong ultraviolet light source (such as from a mercury-vapour lamp).EPROMs are easily recognizable by the transparent fused quartz window on the top of the package, through which the silicon chip is visible, and which permits exposure to ultraviolet light during erasing.Additional Information DRAMDynamic random access memory (DRAM) is a type of semiconductor memory that is typically used for the data or program code needed by a computer processor to function.DRAM is a common type of random access memory (RAM) that is used in personal computers (PCs), workstations, and servers.EEPROMEEPROM (electrically erasable programmable read-only memory) is a user-modifiable read-only memory (ROM) that can be erased and reprogrammed (written to) repeatedly through the application of higher than normal electrical voltage.Unlike EPROM chips, EEPROMs do not need to be removed from the computer to be modified.However, an EEPROM chip has to be erased and reprogrammed in its entirety, not selectively.PROMA programmable read-only memory is a form of digital memory where the setting of each bit is locked by a fuse or anti-fuse. It is one type of read-only memory.The data in them are permanent and cannot be changed.