Card 49 / 72: Which of the following code snippet represents a Singleton design pattern implementation?
A) public class PrintSpooler { public PrintSpooler INSTANCE = new PrintSpooler(); public PrintSpooler () {} public static PrintSpooler getInstance() { return INSTANCE; } }
B) public class PrintSpooler { private PrintSpooler INSTANCE = new PrintSpooler(); private PrintSpooler () {} public static PrintSpooler getInstance() { return INSTANCE; } }
C) public class PrintSpooler { private static final PrintSpooler INSTANCE = new PrintSpooler(); private PrintSpooler () {} public static PrintSpooler getInstance() { return INSTANCE; } }
D) public class PrintSpooler { private final PrintSpooler INSTANCE = new PrintSpooler(); private PrintSpooler () {} public static PrintSpooler getInstance() { return INSTANCE; } }

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