Given an instance of the relation R(ABCD).ABCDa1b1c1d1a1b2c2d2a2b2c2d3a3b3c4d3 Which of the following functional dependencies hold?

Given an instance of the relation R(ABCD).ABCDa1b1c1d1a1b2c2d2a2b2c2d3

1.	Given an instance of the relation R(ABCD).ABCDa1b1c1d1a1b2c2d2a2b2c2d3a3b3c4d3 Which of the following functional dependencies hold?
A.	{AB} → D and D → A
B.	{AB → C and B → D
C.	{AB} → C and B → C
D.	{AB} → D and A → D
Answer» D. {AB} → D and A → D

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Given an instance of the relation R(ABCD).ABCDa1b1c1d1a1b2c2d2a2b2c2d3a3b3c4d3 Which of the following functional dependencies hold?

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