Multiple choice closed-ended questions allow the respondents to choose one or more answers from a given list of answer options. You can define the answer options of your own choice or you can use a pre-existing set of dichotomous answers, such as yes/no, true/false, or ranking scale response options. It also allows you to add "other" option where the respondents can fill in their own answer choice. You can also add the NA (not applicable) option.
Once you added questions to a survey, by default, the validation option is turned off. If the validation option is disabled, respondents can continue with the survey without answering the question. By enabling the validation option you can see a drop-down with options - force response and request-response.
Force response option makes a question mandatory.
When you select Request response option, the respondent gets a pop-up in case a question is not answered, requesting to answer the question or continue survey without answering.
Custom validation messages: You can set a customized validation message as well.
Select at most/exactly/at least: You can put validation on number of answer options which a respondent must select before proceeding to the next question. For example, if you want the respondent to select minimum 3 answer options then choose select at least from the drop down and set the value as 3.
This feature is available with the following licenses :