Explanation/Reference:
B: Embeddable classes have the same rules as entity classes but are annotated with the javax.persistence.Embeddable annotation instead of @Entity.
Example: @Embedded ZipCode zipCode;
C: @ManyToOnedDefines a single-valued association to another entity class that has many-to-one multiplicity.
Example2:
@Entity
public class Employee {
@Id int id;
@Embedded JobInfo jobInfo;
...
}
@Embeddable
public class JobInfo {
String jobDescription;
@ManyToOne ProgramManager pm; // Bidirectional
}
Reference: javax.persistence, Annotation Type ManyToOne