Explanation
### Why this is right
- **Quotation marks can search for an exact phrase.** They tell the search system to keep the words together in that order.
- **AND can require both search terms to appear.** This usually narrows results.
- **OR can broaden a search by including alternatives.** Results may include either term.
- **NOT can exclude a term from results.** It removes records containing the excluded term.
### The concept
Limiters, such as peer-reviewed or full-text filters, narrow results to selected criteria rather than adding unrelated records.
### The other options
- **A limiter such as peer reviewed broadens a search by adding unrelated records.** A limiter filters results to a selected group, so it generally narrows them.
### Remember
AND narrows, OR broadens, and NOT excludes.
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