1. Which of the following relations is in Third normal form(3NF)?
a) R(ABCD) FD’s: AD → C ; D → A ; A → C ; ABC → D
b) R(ABCD) FD’s: A → B ; B → A ; A → D ; D → B
c) R(ABCD) FD’s: AB → C ; BCD → A ; D → A ; B → C
d) R(ABCD) FD’s: C → B ; A → B ; CD → A ; BCD → A
2. Let R(ABCD) be a relation with functional dependencies A → B,C → D, AD → C, BC → A Which of
OR
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