AAsking the model to reason step by step — working through its logic before answering
BAsking the model to answer instantly — skipping any reasoning to save on the time
CLinking many models in a chain — each one refines the previous model's own output
DChaining user messages together — merging a whole chat into one single request
Why this is the answer
Chain-of-thought asks the model to reason step by step before giving an answer. It's not about answering instantly, linking models, or merging chat messages.