Which type of RAM is faster and DOES NOT require refreshing?

The correct answer is A, SRAM. Static RAM stores each bit in a flip-flop circuit made of several transistors, usually six, so the bit stays put as long as the power is on and never needs refreshing. That makes SRAM very fast, but also costly and bulky, so it is used in small amounts as cache memory inside the processor. Both kinds of RAM are volatile and lose their data when the power goes off. B is wrong because DRAM stores each bit as a charge in a tiny capacitor that slowly leaks, so it must be refreshed every few milliseconds; it is cheaper and denser, and serves as the main memory. C is wrong because flash memory is non-volatile storage used in pen drives, memory cards and SSDs, and it is slower than RAM. D is wrong because ROM is read-only, non-volatile memory that holds start-up instructions, not a type of RAM. Exam tip: SRAM = static, fast, no refresh, used as cache; DRAM = dynamic, needs refresh, used as main memory.