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Clarification Request: Plurality of Gap Match

Clarification Request: Plurality of Gap Match

Reading https://www.imsglobal.org/question/qtiv2p1/imsqti_infov2p1.html#element1..., a question of interpretation comes up around the statement "Each gap can have at most one choice associated with it." Does that mean that the student is only allowed to supply one token for the gap (i.e. the gap won't take more than one token) or is the answer key only allowed to supply one possible correct token for the gap?