Which type of RAM is typically faster but more expensive than DRAM?

Correct answer: SRAM

Option A is correct because SRAM (Static RAM) stores each bit using a flip-flop circuit made of multiple transistors, which eliminates the need for periodic refresh cycles and results in significantly faster access times than DRAM, though at a much higher cost and lower density per chip. Option B is wrong because DDR RAM is a form of DRAM that requires constant refresh cycles, making it slower than SRAM; DDR is used for main system memory precisely because it offers high density at low cost, not maximum speed. Option C is wrong because ROM (Read-Only Memory) is non-volatile storage used for firmware and is not compared to DRAM in terms of read/write speed for general computing tasks. Option D is wrong because SDRAM (Synchronous DRAM) is another variant of DRAM synchronized to the system bus clock; it is faster than asynchronous DRAM but still far slower than SRAM.