A major difference between online search engines and periodical indexes, such as ERIC is

Question

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Online search engines and periodical indexes both allow for searches on specific terms or phrases, but periodical indexes such as ERIC use a controlled vocabulary and subject descriptors to standardize and improve search results. Online search engines, on the other hand, may rely more on algorithms and popularity metrics to determine relevance and may not have the same level of organization or consistency in their search results. Therefore, the best choice is D - both B and C - to accurately reflect the difference between online search engines and periodical indexes.

A Major Difference Between Online Search Engines and Periodical Indexes