What is the 'zone of proximal development' (ZPD) as described by Vygotsky, and how should tutors apply it?
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A
The range of tasks a student can do independently without any help
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B
The range of tasks a student cannot yet do independently but can accomplish with guidance, representing the optimal teaching zone
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C
The level of work that is too difficult even with support
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D
A physical zone in the classroom where students learn best