The correct answer is RAM.

• Random-access memory is a form of computer memory that can be read and changed in any order, typically used to store working data and machine code.
• A random-access memory device allows data items to be read or written in almost the same amount of time irrespective of the physical location of data inside the memory.
• In contrast, with other direct-access data storage media such as hard disks, CD-RWs, DVD-RWs, and the older magnetic tapes and drum memory, the time required to read and write data items varies significantly depending on their physical locations on the recording medium, due to mechanical limitations such as media rotation speeds and arm movement.

• An EPROM, or erasable programmable read-only memory, is a type of programmable read-only memory chip that retains its data when its power supply is switched off. 
• Read-only memory is a type of non-volatile memory used in computers and other electronic devices.
• Data stored in ROM cannot be electronically modified after the manufacture of the memory device.