$(5)$ Let $$latency$$ be defined as the time for the CPU to detect the arrival of a unit of input data

from an I$/$O device and place the data into a CPU register. Rank the three techniques listed

below based on latency. Use #$1$ through #$3$ to denote the shortest latency to the longest latency.

Explain your answer.

$$ interrupt driven I$/$O

$$ DMA based I$/$O

$$ direct programmed controlled I$/$O