Normalization & Functional Dependencies

Consider the following four relational schemas. For each schema, all non-trivial functional dependencies are listed. The underlined attributes are the respective primary keys. Schema I: Registration ($\underline{\text{rollno}}$, courses) Field 'courses' is a set-valued attribute containing the set of courses a student has registered for. Non-trivial functional dependency: rollno $\rightarrow$ courses Schema II: Registration ($\underline{\text{rollno, courseid}}$, email) Non-trivial functional dependencies: rollno, courseid $\rightarrow$ email email $\rightarrow$ rollno Schema III: Registration ($\underline{\text{rollno, courseid}}$, marks, grade) Non-trivial functional dependencies: rollno, courseid $\rightarrow$ marks, grade marks $\rightarrow$ grade Schema IV: Registration ($\underline{\text{rollno, courseid}}$, credit) Non-trivial functional dependencies: rollno, courseid $\rightarrow$ credit courseid $\rightarrow$ credit Which one of the relational schemas above is in 3NF but not in BCNF?