单选题

You create a data block based on a relation table containing a REF column. You select the REF column for your form module. Which statement about the REF column is true?()

AIt is created as a nondisplay item. 

BThe Lock Record property is set to Yes. 

CIt cannot be referenced in item level triggers. 

DIt is placed on the canvas with the highest sequence number.

正确答案

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