Hi @fede2786,
as I am using this plugin a lot for my choir:
Yes, you can either make each poll accept only one answer of several options (radio buttons) or select multiple answers from several options (check boxes). You can even tell the plugin how many multiple answers are allowed to be picked from the several options.
And with the “Foodle Add On For Democracy Poll” plugin (my plugin), you can even issue mixed polls with radio buttons and check boxes in a single poll. Although it is designed to present the poll results of registered voters in many fancy ways, one could just use the mixed poll functionality for any voters.
By the way:
Democracy Poll works also with the upcoming WordPress 6.2 – at least per my checks.
Regards
Michael