Checkbox with multiple values needs to be added to the business object

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I have a checkbox which can have multiple values selected. I need the values selected to go into a field in the business Object,

What should be the type of the field (there no type of array) in the business object so that it can hold multiple values. I am fine if it is stored as comma separated value. But I am not able to save it in as it complains with unable to parse payload.

 

ps: I am just starting with visual builder