Final answer:
A keyword search in a library database usually provides a detailed summary of the contents of relevant materials. General-interest and subject-specific databases assist researchers in finding credible sources, while reference librarians can help with search strategies.
Step-by-step explanation:
A keyword search of a library database will typically turn up D. a detailed summary of the contents of relevant materials. This summary often comes in the form of an abstract, which helps researchers quickly ascertain the relevance of an article or resource in relation to their research topic. Not only do databases index articles from newspapers, magazines, and scholarly journals, but they also provide bibliographic information such as the author, title, publisher, and publication date. However, they typically do not provide personal details about an author or information about who has previously used the source.
When you begin your research, a general-interest database offers a starting point and covers a wide range of topics from many sources. As your research becomes more focused, specialized subject databases may be more helpful. A reference librarian can assist with search strategies to obtain a manageable number of relevant sources.