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Q40 Single choice

Which of the following code blocks returns a DataFrame showing the mean value of column "value" of DataFrame transactionsDf, grouped by its column storeId?

A
transactionsDf.groupBy(col(storeId).avg())
B
transactionsDf.groupBy("storeId").avg(col("value"))
C
transactionsDf.groupBy("storeId").agg(avg("value"))
D
transactionsDf.groupBy("storeId").agg(average("value"))
E
transactionsDf.groupBy("value").average()

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