Question:What exactly is a Foreign key? 

A A Foreign key is a column or a set of columns that uniquely identifies rows in a table 
B A Foreign key checks the number of columns in a table which have non-null values 
C A Foreign key is used to match columns in other tables 
D A Foreign key checks the number of rows in a table which have non-null values 

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C 

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Md. Habib Ullah

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