$A,BC$

$CB$

$CD$

$B,CF$

$DE$

Find all candidate keys of R$1.(2$ PTS$)AB$ and $AC$ are the two candidate keys.

Is R$1$ in $2NF?$ Justify your answer. $(1$ PT$)$ Not $2NF,C$ D breaks $2NF$

Is R$1$ in $3NF?$ Justify your answer. $(1$ PT$)$ Not $3$NF D$->$E

Is R$1$ in BCNF$?$ Justify your answer. $(1$ PT$)$ Not in BCNF additionally because $CB$