Showing Explanations of wrong answers / Test Results

I purchased the Pro version to test out the details - and here is where I
have more questions now -

As for the explanations - I need to have the explanations be conditional
- meaning - if they get a wrong answer then the explanation of why that
answer is wrong will appear at the end of the test - all the wrong answers
will show an explanation - Is that possible?

It was suggested to make them answer the question first and show the explanation in the next step - however that is not what I am trying to do.

The user should be able to take the test - and when it is graded - any answers that were incorrect, the explanation would then show to the user.

I hope that makes sense - Thank you so much

Colleen Nelson