The correct answer is A. 5.
DMA (direct memory access) is a feature of some computer systems that allows certain hardware devices to access memory directly, without going through the CPU. This can improve performance, as it allows the device to access memory without having to wait for the CPU to be available.
The floppy drive is a storage device that was once commonly used to store data on floppy disks. Floppy disks are small, portable disks that can be used to store data or programs. The floppy drive uses DMA channel 5 to access memory.
DMA channel 5 is one of the eight DMA channels that are available on most computers. Each DMA channel is assigned a specific purpose, and DMA channel 5 is assigned to the floppy drive. This means that the floppy drive can access memory directly through DMA channel 5, without having to go through the CPU.
The other options are incorrect because they are not DMA channels that are assigned to the floppy drive. Option B, DMA channel 4, is assigned to the hard drive. Option C, DMA channel 1, is assigned to the keyboard. Option D, DMA channel 9, is assigned to the serial port. Option E, DMA channel 2, is assigned to the parallel port.
In conclusion, the floppy drive uses DMA channel 5.