Exam: Don't show correct answers if there's a re-attempt option

Exam widget and "Show correct answers: this shows which answers were right/wrong for each question."

--> There should be an option to NOT show the correct answers after the first attempt if the "try again" option is selected. 

Thanks for the idea! How would you feel if the right/wrong answers would be shown only when user passes the exam? Or should the user see the right/wrong also when the user has failed all the retrys? 

I can't say what the bets practice would be in general, but in my case, I don't think they should be shown after the maximum number of retry attempts; instead, one sholuld be directed to return to the training materials.

(Currently, the issue is that it isn't possible to only show which ones are wrong without showing the correct answers, as in the screenshot below. I guess this would be fine for learning  purposes if one has passed the exam, but not if there's an intention to try again.)