Adding a CAPTCHA to a Survey will help prevent robots from filling out the form on the front end of your website. To add one:
  1. Navigate to Content > Surveys
  2. Enter the name of the Survey in the search field
  3. Click Search
  4. Under the Actions column, click Edit
  5. On the left hand navigation pane, select Include Questions
  6. Click the Add Questions button
  7. From the Question Type dropdown menu, select CAPTCHA
  8. Click Next
  9. Enter the required Question Text to instruct the user to complete the CAPTCHA
  10. Under Answer Required, mark the checkbox to 'Yes, require a response to this question'
  11. Click Finish