Your question is Core Spark and Storage Concepts. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Explain the differences between persist and cache in Spark, what init does, the difference between args and kwargs, and when you would choose JSON vs Parquet and columnar storage in a distributed data pipeline.