How do XFA validations map to validation-Required (nullTest) in adaptive forms?

How do XFA validations map to validation-Required (nullTest) in adaptive forms?
A . validateMessage
B. mandatory
C. mandatoryMessage

Answer: B

Explanation:

This is how XFA validations map to validation-Required (nullTest) in adaptive forms. The mandatory property specifies whether a field is required or not. If it is set to true, the field cannot be left blank. If it is set to false, the field can be left blank.