<ul>
<li><b>No</b>: To complete the survey, the respondent must either receive an email invitation where he / she clicks on the link to automatically transfer the code to the survey, or the respondent must know the code and enter it manually in the survey.</li>
<li><b>Yes</b>: Users who did not receive the code can also take the survey.</li>
<li><b>Author only</b>: In addition to users who have the code, they can the code-free survey is also completed by the authors of the survey (mainly for test purposes).</li>
</ul>