Which task is valid?

You want to make a field on a page mandatory.

Which task is valid?
A . Configure the Allow_Nulls property of the entity’s attribute to be set to false.
B . Configure the Require_Mandatory property of the entity’s attribute to be set to true.
C . Specify the name of the field in the Mandatory_Fields property of the modeled operation’s argument struct.
D . Write a custom Java function to check for a value being present and specify the function on the Custom_Validation_Function_Name property of the relevant domain definition.

Answer: C

Explanation:

Reference: https://www.ibm.com/support/knowledgecenter/SS8S5A_7.0.9/com.ibm.curam.content.doc/ServerModelling/ctr_CuramServerModellingGuide.html