An Erasable Programmable Read-Only Memory (EPROM) retains its content until it is exposed to the ______________.

Correct option is D

· Ultraviolet light: EPROM chips are erased by exposing them to ultraviolet (UV) light through a quartz window on the chip. This process resets the memory cells, allowing the chip to be reprogrammed with new data.
· Magnetic signals: Magnetic signals are used in devices like hard drives and magnetic tapes, but they do not erase the contents of EPROM.
· Electrical signals: Electrical signals are involved in the operation of most semiconductor devices, but they do not erase EPROM. Electrically Erasable Programmable Read-Only Memory (EEPROM) can be erased with electrical signals, but not EPROM.
· Radio signals: Radio signals are used for wireless communication, such as in radios and wireless networks, but they do not affect the contents of EPROM.