Answer: Wow that's really cool!
The answer is Design Process. <span>The cyclical, multistep process by which designers and engineers design, build, and taste a new product is called Design Process. </span><span>There are multiple steps, including exploring, designing, planning, making, testing, and revising.</span>
<span>Before GUIs became popular, the command line interface (CLI) was the most commonly used.
</span>GUI stands for Graphical User Interface . Like its name says it is a graphical interface <span>that allows interaction with users through graphical icons and visual indicators , rather than through text-based interface.</span><span>
Command line interace (CLI) is text-based interface in which </span>the user <span>issues commands to the program in the form of successive lines of text.</span>
The answer is 2-to-the-power-of-n, since for every input, the number of different combinations doubles. From your list I think answer A is meant to indicate 2ⁿ.
