Boolean operators (e.g., AND, OR, NOT) are used to refine Internet searches by combining or excluding terms to narrow or expand results. Option B (macros) automates tasks in software, not searches. Option C (default commands) is vague and not specific to search refinement. Option D (batch files) automates computer tasks, not Internet searches. This question falls under the Information Technology category, focusing on information retrieval.
[Reference:ETS Praxis Business Education: Content Knowledge (5101) Study Companion, Section on Information Technology; Information Systems, Chapter 7., ]
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