How to prevent or identify duplicate respondents when using Pavlovia survey alone?

Hi. I am new to Pavlovia and I am wondering the best ways people have found to prevent or to identify respondents who have completed the survey multiple times? (When using Pavlovia only) Is it a combination of IP addresses and times to completion? I understand Pavlovia does not collect IP addresses automatically… so what would be the best way to do this? Thank you