An open question is characterized by the following:
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May result in unexpected information - True. Open questions allow respondents to provide detailed answers, which can lead to unexpected insights or information.
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May result in too much information - True. Since open questions solicit expansive responses, they can sometimes yield more information than the asker intended or needed.
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Multiple choice answers - False. Open questions do not provide structured answer options; instead, they allow for free-form responses.
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True or false answers - False. Open questions do not limit responses to binary choices like "true" or "false"; they invite elaboration and discussion.
So, if you need to choose from these options, the first two statements about open questions being able to yield unexpected information and potentially too much information are true.