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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Theaccountingmanagerwantsyoutocreateaformthatwhenqueriedwilldisplayacalculatedtotalofyear-to-dateactualexpendituresforthefoundcodeentered.Thevaluesneededtogeneratethissummarydataarestoredinmultipletables.WhichdatasourcetypecanyouassigntothedatablockforthisformwithouthavingtheDBAcreateadatabaseobject?（）
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