Given the relations:

$\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$

RELATIONS

book$($title$,$ author, book$\_$id$,$ publisher, year, price$)$

favourite$($title$,$ author, bookid$)$

$\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$

Given the following dependencies:

DEPENDENCIES

$($title$,$ author$)-->$ book$\_$id

book$\_$id$-->($title$,$ author publisher, year$)$

$($publisher$,$ year title$)-->$price

$\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$

Which of the following is TRUE?

a$.$

Favourite is not in $3$NF$.$

b$.$

Both tables are in $4$NF$.$

c$.$

Both tables are in $2$NF only.

d$.$

Favourite is in $4$NF$.$ Book is in BCNF$.$