Variables can be divided into four categories: static, stack-dynamic, explicit heap- dynamic, and implicit heap-dynamic. For each variable in the Java class below, specify which category it belongs to. Include both named variables and anonymous variables in your answer.

public class Test {

private static String ext = .gif;

public static void main( String[] args) {

String file = demo;

NameBuilder builder = new NameBuilder(ext);

System.out.println(builder.buildName(file));

}

}