question_answer

Match the following:

S. NO	A	S. NO	B
1.	Cardinality	[A]	Cannot contain null value.
2.	Unique key	[B]	Ensures that data in the database is valid and correct.
3.	Data integrity	[C]	Has eligibility to make primary key.
4.	Candidate key	[D]	The number of tuples in a relation.
		[E]	Can contain null value.

A)  1\[\to \]D, 2\[\to \]E, 3\[\to \]B, 4-\[\to \]C

B)  1\[\to \]D, 2\[\to \]E, 3\[\to \]A, 4\[\to \]B

C)  1\[\to \]B, 2\[\to \]C, 3\[\to \]D, 4\[\to \]E

D)  1\[\to \]C, 2\[\to \]E, 3\[\to \]B, 4\[\to \]B

E)  None of these