The multiple-choice select many question type allows you to ask the respondents to select multiple answers from the predefined set of answer options.
To add a multiple-choice select many question:
Under Basic Question type, click on Multiple Choice » Select Many
A multiple-choice select many question will appear on your survey.
Request Response: When you select request response, the respondent gets a pop-up in case a question is not answered, requesting to answer the question or continue survey without answering.
Force Response: By selecting the validation option you can see a popup with the following options: None, Force Response and Request Response. By default the "None" option is selected. Force response option makes a question mandatory/required, as shown in the image below.
Select at most/exactly/at least: You can put validation on the number of choices which a respondent must select before proceeding to the next question. For example, if you want the respondent to select maximum 2 answer options then choose select at most from the drop-down and set the value as 2.
This feature is available with the following licenses :