Correct Answer:
B. SRAM does not require constant refreshing, making it faster but more expensive
SRAM (Static RAM) and DRAM (Dynamic RAM) are distinct types of Random Access Memory. The statement that best explains their usage is that SRAM does not require constant refreshing, making it faster but more expensive. SRAM uses latches to store bits, maintaining data as long as power is supplied without needing periodic refreshes. This makes it significantly faster and more complex, hence more expensive per bit, ideal for the CPU's high-speed cache memory. DRAM, conversely, stores bits in capacitors that leak charge, requiring constant refreshing, which makes it slower but simpler and cheaper, suitable for larger main memory.
- Option A is incorrect; SRAM is faster, not slower.
- Option C is incorrect; both SRAM and DRAM are volatile, losing data when power is off.
- Option D is incorrect; DRAM has higher storage density due to its simpler cell structure.