How the author define the thinkLet?

How the author define the thinkLet? A: They define a thinkLet as an activity or process that produces predictable results to deal with recurring collaboration problems in software development teams. B: A ThinkLet can’t be seen as a kind of process pattern to address collaboration problems. C: ThinkLets can’t be seen as building block for collaborative processes. D: Internal communication deals with the challenge of each team member to conduct effective communication with his peers.