Which of the following statements about MapReduce is true?
A. MapReduce source programs must be written in Java
B. The output from MapReduce is one or more files stored in the DFS
C. MapReduce programs always have four phases: Mapper, Shuffle, Combiner, and Reducer
D. Intermediate files, sent from Map tasks to Reduce tasks, are replicated with the number of copies equal to the number of Reducers
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