Which of the following is true of children's zone of proximal development?
1) It refers to an area in which children develop new cognitive skills as a function of working with more skilled people.
2) It refers to an area in which children develop new cognitive skills through self-learning.
3) It refers to an area in which children develop new cognitive skills through self-learning.
4) It refers to an area in which children develop their drawing skills on their own with the passage of time.