20. 附圖是藉由 MapReduce 進行詞頻統計(word count)工作的流程示意圖。請問圖中對應的動作組合應為下列何者?
(A) Mapping -> Splitting -> Shuffling -> Reducing
(B) Splitting -> Mapping -> Shuffling -> Reducing
(C) Reducing -> Splitting -> Mapping -> Shuffling
(D) Splitting -> Shuffling -> Mapping -> Reducing
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統計: A(1), B(5), C(1), D(2), E(0) #3219304
統計: A(1), B(5), C(1), D(2), E(0) #3219304