If a1, a2, a3 are attributes in a relation and S is another relation, – McqOptions

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1.	If a1, a2, a3 are attributes in a relation and S is another relation, which of the following is an incorrect specification of an integrity constraint?
A.	primary key(a1, a2, a3)
B.	primary key(a1)
C.	foreign key(a1, a2) references S
D.	foreign key(a1, a2)
Answer» E.

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