Set a maximum number of selections in a multiple-choice field

I have a use case where my form uses a multiple-choice field. In this particular case, I would like the maximum number of selections made to be four (4).

I work in the financial industry and this form is an application for credit. By federal regulation, when credit is declined, you have to provide the applicant the reason(s) why it was declined - but, according to regulatory guidance, you should provide no more than four reasons. So it would be helpful if there was a way to set a maximum number of selections that can be made in the multi-choice field I've set up to choose the reasons for decline.