A Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â integrity constraint requires that the values appearing in speciï¬ed attributes of any tuple in the referencing relation also appear in speciï¬ed attributes of at least one tuple in the referenced relation.

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1.	A Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â integrity constraint requires that the values appearing in speciï¬ed attributes of any tuple in the referencing relation also appear in speciï¬ed attributes of at least one tuple in the referenced relation.
A.	referential
B.	referencing
C.	speciï¬c
D.	primary
Answer» B. referencing