Correct/Incorrect banner to show on a custom review layer

I have a quiz with several graded questions and one freeform question. When reviewing, I need to show the correct/incorrect answers and also want the Correct/Incorrect banner to be visible 

This happens automatically with Graded questions - how do I show the correct/ incorrect  banner on my custom review layer for the freeform question?

Any assistance with this would be appreciated

Thanks

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