In the neuro-cognitive context of Lev Vygotsky's 'Sociocultural Theory of Development', which of the following statements is most appropriate and true regarding the neuro-biological nature of the 'Zone of Proximal Development' (ZPD) and 'Scaffolding' proposed by Vygotsky, the collaborative neuronal synchronization between the brain's 'Dorsolateral Prefrontal Cortex' (DLPFC - executive control and cognitive planning), the 'Temporoparietal Junction' (TPJ - social cognition and perspective-taking), and 'Broca's & Wernicke's Areas' (processing of social language and private speech), inter-brain coupling, and the activation dynamics of white matter tracts (such as the Superior Longitudinal Fasciculus), along with their interrelationship with Jerome Bruner's scaffolding concept and implications for modern primary and upper-primary inclusive classroom teaching, 'Neuro-Vygotskian Optimized Socio-Cognitive Pedagogy', and the enhancement of collaborative problem-solving, self-directed learning, and holistic socio-emotional-cognitive competence in students?