Consider the following relation.

A$-$ Given the previous extension $($state$),$ which of the following dependencies may hold in the

above relation? If the dependency cannot hold, explain why by specifying the tuples that cause

the violation.

$AB$

$BC$

$CB$

$BA$

$CA$

B$-$ Does the above relation have a potential candidate key that consists of only one attribute? If it

does, what is it$?$ If it does not, why not?

C$-$Does the above relation have a potential candidate key that consists of multiple attributes? If it

does, what is it$?$ If it does not, why not?