When you want to prevent multiple responses from the same person, you can generate a unique URL that can only be accessed once. Learn how to generate a unique URL.
You can set Restrictions when you want to restrict or protect your survey responses with a password. You can set a cut-off date or maximum response count, and secure your survey responses by adding a password. Learn how to set restrictions on a survey.
If you want to publish a survey to specific groups or portals, Visibility settings will get the job done. Learn how to change the visibility settings of your survey.