I need a three page paper on the Constructivist Theory. Please include the work and thoughts of Jean Piaget, Maria Montessori, and Lev Vygotsky. Also include a description of Vygotsky’s Zone of Proximal Development (ZPD) and scaffolding etc. You will also need to answer the following question….What learning objectives does this topic cover? Please explain in detail. You may only use academically credible sources. Thank you!