Which of the following memory is non-volatile?Select one:a.SRAMb.DRAMc.ROMd.All of the mentioned

The answer is c. ROM.

ROM stands for Read-Only Memory. It is a type of non-volatile memory. Non-volatile memory is a type of computer memory that can retain the stored information even when not powered. Examples of non-volatile memory include read-only memory (ROM), flash memory, most types of magnetic computer storage devices (e.g. hard disks, floppy disks, and magnetic tape), optical discs, and early computer storage methods such as paper tape and punched cards.

On the other hand, SRAM (Static Random Access Memory) and DRAM (Dynamic Random Access Memory) are types of volatile memory. Volatile memory is computer memory that requires power to maintain the stored information. Most modern semiconductor volatile memory is either static RAM (SRAM) or dynamic RAM (DRAM). SRAM retains its contents as long as the power is connected and is easy to interface to but uses six transistors per bit. DRAM stores a bit of data using a transistor and capacitor pair, which together comprise a DRAM cell. The capacitor holds a high or low charge (1 or 0, respectively), and the transistor acts as a switch that lets the control circuitry on the chip read the capacitor's state of charge or change it.