In which mode is the indicator of the presence/absence of a word in search used?

This question asks about how we tell MySQL to look for a specific word in our search results. Think of it like searching for a book in a library.

The options tell us different ways to search:

Option A: Natural language - This is like searching the library by describing the book's content. It's a flexible way to search, but it may not be as precise.
Option B: Boolean mode - This is like searching for a book by its exact title. It's a very precise way to search, using keywords like "AND", "OR", and "NOT".
Option C: Query expansion - This is like searching for books with similar titles or subjects. It expands your search to include related terms.
Option D: Cross mode - This isn't a common term in MySQL searching.

The answer is Option B: Boolean mode. Boolean mode is the mode where you use keywords like "AND", "OR", and "NOT" to find the exact words you are looking for.

For example, if you search for "book AND author" in Boolean mode, you'll only get results that include both the word "book" and the word "author."