You are a member of a team designing an automatic door$-$opening device so wheelchair users can enter and exit buildings on campus. Which of the modeling methods available to your design team are appropriate in each of the following situations:

a$.$ Preliminary design review with your immediate engineering $($technical$)$ supervisor

b$.$ Discussions of installation details with the campus architectural staff

c$.$ Meeting with a group of nontechnical advocates for accessibility by persons with disabilities

d$.$ Meeting with machine shop technicians who will fabricate your prototype