You want to find information about Java. You visit a popular search engine and manually search through a directory tree of topics until you find a directory titled "computers" and a subdirectory titled "programming Languages". You select the topic "Java" and look through a list of indexed pages on that topic, then choose one page with which to begin your research. Which type of search index did you use?

A.
Static index.

B.
Full-text index.

C.
Boolean index.

D.
Keyword index.