Final answer:
The NOT operator takes Boolean expressions and reverses their logical value. The correct answer is option c).
Step-by-step explanation:
The NOT operator takes Boolean expressions as its operand and reverses its logical value. For example, if you have a Boolean expression that is initially true, the NOT operator would flip this to false, and vice versa. In the context of search engines or databases, it is often used to exclude certain terms from your search results, helping to focus the search more precisely.
To elaborate on usage with an example, if you wanted to exclude articles with the term 'spoilers' from your search results about a new movie, you might use a search string like 'new movie title -spoilers', where the minus sign is a common representation for the NOT Boolean operator.