A relation is in second normal form $(2$NF$)$ if and only if it is in $1$NF and $\_\_\_\_\_\_\_\_.$

Question $45$ options:

A$)$

every attribute is a candidate key

B$)$

every candidate key is a determinant

C$)$

there are no non$-$key attributes determined by another non$-$key attribute

D$)$

all non$-$key attributes are determined by the entire primary key