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:
Force response option makes a question mandatory/required, as shown in the above image. The respondents cannot finish survey without answering a mandatory question.
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.
This feature is available with the following licenses :