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Answer: All of the above
1. **spark_version**: This specifies the Apache Spark version for the cluster, ensuring compatibility and access to features. 2. **autoscale**: Enables dynamic adjustment of worker nodes based on workload, optimizing resources and costs. 3. **node_type_id**: Determines the VM instances for worker nodes, affecting CPU, memory, and performance. All three are essential for tailoring the cluster to specific needs.
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