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Q30 Single choice

Which of the following describes the role of tasks in the Spark execution hierarchy?

A
Tasks are the smallest element in the execution hierarchy.
B
Within one task, the slots are the unit of work done for each partition of the data.
C
Tasks are the second-smallest element in the execution hierarchy.
D
Stages with narrow dependencies can be grouped into one task.
E
Tasks with wide dependencies can be grouped into one stage.

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