(b) Sentence Segmentation
Under Sentence Segmentation, the whole corpus is divided into sentences, and each sentence is taken as different data, reducing the corpus to sentences.
Source: Text Processing, Section 6.5
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The passage in Section 6.5 directly defines Sentence Segmentation as the step where "the whole corpus is divided into sentences" — the question uses this exact language. Tokenisation comes after segmentation (it breaks sentences into individual tokens). Students must not confuse the two steps.