A list of correct and incorrect answers. Each answer can have a message explaining why it is correct/incorrect. There may be multiple correct answers if multiple formats are accepted. For example, some questions might accept either a fraction or a decimal as correct.
The first answer that matches (correct or incorrect) is the scoring result (so order of answers is very important).
When true, allows shorthand coefficient entry: "-" means -1
and an empty string ("") means 1.
Scoring rubric for the NumericInput widget.