Labels cannot be removed after they have been created is the correct choice because that statement is the one that is false about Labels in TrackerPro.

The statement is incorrect because labels are not permanent and they can be removed when they are no longer needed. Users can edit an issue to remove labels and administrators or users with the right permissions can clean up or delete labels from the system so labels do not have to remain once created.

Label values are case sensitive is not the incorrect statement. Label value case sensitivity is a real property of many issue trackers and therefore that claim does not make it the wrong option in this question.

Labels are displayed as clickable links to related issues is not the incorrect statement. Labels are commonly shown as links or filters that let users view related issues, so this behavior supports the statement rather than contradicting it.

The Labels field can be used in the Issue Metrics gadget is not the incorrect statement. The Labels field is often available for filtering and grouping in reporting and gadget views, so this option does not represent a false claim about label capabilities.

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