Selecting N out of M answer options - How to?

I want respondents to select only N out of M possible answer options. How can I set this up?

Under the Edit Survey page click on the Settings link in the tools console for the question.

1. Screenshot

Survey Software Help Image
In the Settings option enable validations and select either Exactly OR As many as radio button. Select the number of options you want to allow to be selected and save the settings.

2. Screenshot

Survey Software Help Image
Preview and test the Survey.

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