The correct answer is C. SRAM.
SRAM (Static Random-Access Memory) is a type of computer memory that is faster and more expensive than DRAM (Dynamic Random-Access Memory). SRAM is used as cache memory in computers to store frequently accessed data.
DRAM (Dynamic Random-Access Memory) is a type of computer memory that is slower and less expensive than SRAM. DRAM is used as main memory in computers to store data and programs that are currently being used.
Flash memory is a type of non-volatile memory that is used in solid-state drives (SSDs), USB drives, and other portable devices. Flash memory is slower than SRAM and DRAM, but it is more durable and can be erased and reprogrammed more times.
EEPROM (Electrically Erasable Programmable Read-Only Memory) is a type of non-volatile memory that can be erased and reprogrammed electrically. EEPROM is slower than flash memory, but it is more durable and can be erased and reprogrammed more times.
PROM (Programmable Read-Only Memory) is a type of non-volatile memory that can be programmed once using a special device. PROM is slower than EEPROM and flash memory, and it cannot be erased or reprogrammed.
In conclusion, the correct answer is C. SRAM.