How to Show Quiz summary with correct answers

How to show correct answer on summary page after the user is done taking the quiz..

I noticed this feature in http://www.ajonit.com website. I took the screenshot of the same for reference… check this link http://goo.gl/3qZLni

I don’t find any such settings to enable this feature.. is there a way to do it easily? Kindly help me accomplish this task.

https://wordpress.org/plugins/wp-pro-quiz/