Identify the principle for each of the following examples of choice architecture design. $-$ A computer message asking whether you want to save a file before closing it $-$ A recommendation system that translates technical product features such as CPU speed and memory capacity into descriptions of the type of tasks a PC is suitable for such as video gaming or word processing $-$ Ride$-$sharing services like Uber charging higher fares during peak demand periods A$.$ Defaults B$.$ Structure complex choices C$.$ Expected error D$.$ Give feedback E$.$ iNcentives F$.$ Understanding mappings