单项选择题

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?（）

A.It is created as a nondisplay item.
B.The Lock Record property is set to Yes.
C.It cannot be referenced in item level triggers.
D.It is placed on the canvas with the highest sequence number.

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