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Which of the following code blocks concatenates rows of DataFrames transactionsDf and transactionsNewDf, omitting any...

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Which of the following code blocks concatenates rows of DataFrames transactionsDf and transactionsNewDf, omitting any duplicates?

A.

transactionsDf.concat(transactionsNewDf).unique()

B.

transactionsDf.union(transactionsNewDf).distinct()

C.

spark.union(transactionsDf, transactionsNewDf).distinct()

D.

transactionsDf.join(transactionsNewDf, how="union").distinct()

E.

transactionsDf.union(transactionsNewDf).unique()

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