Which of the following is true?
- A relation in $3 \mathrm{NF}$ is always in $\text{BCNF}$
- A relation in $\text{BCNF}$ is always in $\text{3NF}$
- $\mathrm{BCNF}$ and $3 \mathrm{NF}$ are totally different
- A relation in $\mathrm{BCNF}$ is in $2 \mathrm{NF}$ but not in $3 \mathrm{NF}$