The research and development $($R&D$)$ team at DataCom, a software firm, holds a meeting to discuss some potential ideas for new products. In the meeting, the moderator encourages everyone to share all the ideas that come to mind, no matter how trivial it may seem. He prohibits employees from criticizing any idea and instead asks them to focus on giving the maximum number of ideas. In this scenario, what is the R&D team at DataCom engaged in$?$

$$ a$.$ idea screening

b$.$ brainstorming

c$.$ beta testing

d$.$ concept testing