I am trying to understand how browser cookies work and what the privacy implications are for my respondents. I want to run a survey that asks some potentially sensitive information that the respondents may not want other people in their life to see, e.g. if they share a computer. However, I would also like to provide the option to return and complete the survey later, and offer the respondent a choice about this. 

I understand that if I use the setting to allow respondents to return and complete the survey later, that qualtrics uses a browser cookie to save progress. But what happens once they complete and submit the survey? Does the cookie get deleted? Are they still able to see their previous responses if they load the survey in that browser?