In early childhood, how does a) physical (e.g., body and brain), b) cognitive (e.g., thinking, theory of mind, executive functioning), and c) psychosocial (e.g., self-concept, rough and tumble, sociodramatic play) domains contribute to emotional regulation? (Must include specific developmental concepts for each domain, describe how they apply, and give relevant examples from early childhood (3- to 6-years-old)