For relation schema R

$($

A

$,$

B

$,$

C

$,$

D

$,$

E

$,$

F

$)$

$$AND DEPENDANCE SET F

$\{$

D

$-$

$>$

BE

$,$

E

$-$

$>$

AF

$,$

F

$-$

$>$

CD

$,$

AEF

$-$

$>$

$>$

BCD

$\}$

$.$

GIVE DEFINITION OF KEY AND DEFINE THE POSIBBLE KEYS WITH ARGUMENTATION. IN WHICH NORMAL FORM IS R

$-$

$$DEFINE THE FORM AND GIVE ARGUMENTATION WHY R IS IN THIS FORM? IF IT IS IN LOWER THAN

$3$

$$NF NORMALIZE TO

$3$

NF $(->>)$ means multivalued dependance in AEF$->>$BCD