Please explain

6. Given a relation R(A. B. C. D) with the functional dependencies F ABC D. D C). Which highest normal form is the relation in? a BCNF 3NF d) 1NF 7. Given a relation R(A, B. C. D) with the functional dependencies F-AB?C, A-D). Which normal form is the relation in? a) BCNF b) 3NF 2NF 1NF 8. Givep a relation R(A, B, c, D) with functional dependencies F(A-B, A c, A -D), Which highest normal form is the relation in? c) 2NF d) 1NF 9 Given a relation RA B. C. D) with the functional dependencies F-A--B A-C. A-D, C D) which normal form is the relation n? a) BCNF b) 3NF 2NF 1NF