16. What is a local variable? a. A variable declared and used within a single method b. Can be used in a class and all other methods can access it. c. It does not have a limited lifetime d. Its life is limited only to the method in which it is defined 17. This line of code: "import java.util.scanner" is use to read data entry from the keyboard and from files a. True b, False 18. Which o the following are only primitive types when defining a variable type? a. int, float, double b. private, public, int c. Boolean, public, char d. Double, long, private 19. Which of the statements below is a correct choice for calling libraries from Java libraries? a. Export java.util.libraryname; b. Export java util libraryname; c. import java.util.libraryname; d. import jva_util_libraryname 20. When can a loop be used in programming? a. To execute a block of statements once b. To execute a block of statements repeatedly without having to write them multiple times. c. To pass on a value to method d. To suddenly end the code execution