Provide feedback or restrict 'submit' for incomplete answers

When creating a multiple response question that, for example, requires the user to select 3 correct responses out of a possible 6, is there any way to restrict them from clicking on submit until the required number of selections have been made (in this example, if they only select 2 out of the 3 required) or provide them with feedback advising that 3 selections need to be made?

Any input would be welcome.


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