Which regular expression pattern makes the term "confidential data" case insensitive?

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The correct choice for making the term "confidential data" case insensitive is a regular expression pattern that uses a specific syntax to modify the case sensitivity of the match. The pattern /confidential data/i is structured in a way that adheres to common conventions in many programming languages and regex libraries.

In this pattern, the slashes (/) are used to delimit the regular expression itself. The 'i' flag at the end indicates that the match should be case insensitive, meaning it will match variations like "Confidential Data," "CONFIDENTIAL DATA," or "confidential data" without regard to the case of the letters. This flexibility is essential when searching through text where casing might differ.

The other choices do not correctly denote a case insensitive regular expression pattern. The first choice uses square brackets, which denote a character class and would not work as intended for matching the phrase as a whole. The third option attempts to use an 'i' flag in a non-standard format, which does not conform to regular expression syntax. Lastly, using quotes around the term does not invoke any case sensitivity options—it's simply treated as a string rather than a regular expression. Thus, the chosen option effectively addresses the requirement for case insensitivity.

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