Question:Which of the following statements are incorrect regarding referential integrity? 

A A foreign key can refer to a primary key 
B A foreign key can refer to a unique key 
C The on delete cascade clause will work only if there is a reference to a primary key 
D The referred key can either be in the same table or in some other table 
E A foreign key can be composite 
F Referential integrity can only be applied while creating the table 

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C F 

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Md. Habib Ullah

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