13. You must call most methods other than_explicitly to tell them to perform their tasks. a public methods b. main e. static methods d. private methods 14. A key part of enabling the JVM to locate and call method main to begin the app's execution is the keyword, which indicates that main can be called without first creating an object of the class in which the method is declared. a. stable b. private c. static d. public 15. Which of the following statements is false? a. Most classes you'll use in Java programs must be imported explicitly. b. There's a special relationship between classes that are compiled in the same directory. By default, such classes are considered to be in the same package-known as the default package. c. Classes in the same package are implicitly imported into main. d. An import declaration is not required when one class in a package uses another in the same package. 16. An n import declaration is not required if you always refer to a class with its name, which includes its package name and class name. a. compile-time b. default package c. paired d. fully qualified name 17. Declaring instance variablesis known as data hiding or information hiding. a. secure b. private c. static d. masked 18. Java requires acall for every object that's created a. constructor b. destructor c. parameterless d. parameterized 19. Which of the following statements is true? Constructors can specify parameters and return types. b. a. Constructors can specify parameters but not return types. Constructors cannot specify parameters but can specify return types. c. d. Constructors can specify neither parameters nor return types 20. If a class does not define constructors, the compiler provides a default constructor with no parameters, and the class's instance variables are initialized to a. zero b. null c. their default values. d. false