Analyzing the concepts of the 'Zone of Proximal Development' (ZPD) and 'Scaffolding' within Lev Vygotsky's Socio-Cultural Theory, which of the following statements is most authentic and true from a philosophical and scientific perspective regarding cognitive development and the learning process?

According to Lev Vygotsky's socio-cultural theory, the 'Zone of Proximal Development' (ZPD) defines the distance between a child's ability to solve a problem independently and their ability to solve the same problem under the guidance of a More Knowledgeable Other (MKO) such as a teacher, parent, or peer. 'Scaffolding' is the temporary and flexible support provided during this process, which is gradually reduced as the child learns the skill.