Direct Memory Access Is_________

Multiple Choice

Direct memory access is_________.

A) faster than ordinary memory access techniques because it allows each I/O device direct access to the CPU memory
B) handled by a special DMA controller and is usually several times faster than data transfers handled by the CPU
C) faster because it substitutes higher speed static RAM for slower dynamic RAM (DRAM) , which has to be refreshed on a regular basis and thus slows down the entire computer system
D) any one of the above, depending on the particular computer system