Represents a blank submission. For example, if a student does not select any choices for an MC response or does not fill in any blanks on an FITB response, a blank submission results (rather than e.g. an empty array).
Represents a malformed submission that results from a failed attempt to parse a submission from a text representation.
Represents a submission that is well-formed but somehow breaks the rules for a particular question, e.g. an MC submission that has more choices selected that were allowed by a checkbox limit.
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The possible discriminants for different kinds of responses.