Q$2$: Marks$]$:

Given a relation $R(P,Q,R,S,T)$ and Functional Dependency set $FD=\{PQR,ST\}.$ Answer the following questions:

Find all candidate keys. Explain your answer

Identify the best normal form that $R$ satisfies $,$ or $BCNF.$ Explain your answer.

If the relation is not in $BCNF,$ decompose it until it becomes $BCNF$ if possible.