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The search mode that uses natural language search as a subroutine is ____________

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The search mode that uses natural language search as a subroutine is ____________

(a) Natural language

(b) Boolean mode

(c) Query expansion

(d) Cross mode

This question was addressed to me in a national level competition.

This question is from Tuning the Server topic in chapter General MySQL Administration of MySQL

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The correct answer is (c) Query expansion

The explanation is: The query expansion search occurs in two phases. The natural language search is applied in the first phase. Query expansion search is one of the three modes of fulltext searching.

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