A Simple Keyword-Based Search Engine Suffers from Several Deficiencies,which Include

Multiple Choice

A simple keyword-based search engine suffers from several deficiencies,which include all of the following except:

A) A topic of any breath can easily contain hundreds or thousands of documents.
B) Many documents that are highly relevant to a topic may not contain the exact keywords defining them.
C) Web mining can identify authoritative Web pages.
D) Many of the search results are marginally or not relevant to the topic.