Answer: O Review
Step-by-step explanation:
The Review tab is used to configure editing restrictions in Word 2019. The Review tab contains the Protect Document button, which allows you to set and modify editing restrictions on a document. This includes options such as allowing or disallowing changes to the document, setting passwords for editing, and specifying which parts of the document are allowed to be edited.
References tab is used for adding citations and bibliographies to a document. Security tab is not available in Word 2019. Developer tab is used for creating macros, customizing the user interface, and accessing other developer-related features.