OptionalcorrectWhether this option is a correct answer or not
An opaque string that uniquely identifies this choice within the radio widget. The format of this ID is subject to change.
OptionalisIf this is none of the above, override the content with "None of the above"
OptionalrationaleTranslatable Markdown; Rationale to give the user when they get it wrong
Translatable Markdown; The label for this choice