Discussion
Among the different Boolean operators 'AND' is used to :
Answer: C
The AND operator is used to narrow the search.
AND retrieves only records that contain all the terms combined. 'Libraries AND automation' returns records about both together, which is fewer than either term alone, so each extra AND term makes the result set smaller and more precise.
OR is the operator that widens a search, retrieving records with any of the terms (synonyms, variant spellings). NOT also narrows, by excluding a term. No Boolean operator begins or ends a search; those options describe nothing the operators do.
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