7. Which package is imported into every Java dass by defanlt? 8. Which of the following is not a valid code comment in Java? A. // Add to th. ?..talt B.ToDo: i bug 12312 C..Add configurstion val D. Reas tile tron , Which statement about a valid va file is true? It can only contain one class declaration B. It can contain one publie class declaration and ooe pab1sc interface definition. C. It must define at least one public class. D. It may define at most one pubc class