A class games.cards.Poker is correctly defined in the jar file Poker.jar.  A user wants to execute the main method of Poker on a UNIX system using the command：  java games.cards.Poker  What allows the user to do this？（） 

• A、 put Poker.jar in directory /stuff/java， and set the CLASSPATH to include /stuff/java
• B、 put Poker.jar in directory /stuff/java， and set the CLASSPATH to include /stuff/java/*.jar
• C、 Put Poker.jar in directory /stuff/java， and set the CLASSPATH to include /stuff/java/Poker.jar
• D、 put Poker.jar in directory /stuff/java/games/cards， and set the CLASSPATH to include /stuff/java
• E、 put Poker.jar in directory /stuff/java/games/cards， and set the CLASSPATH to include /stuffijava/*.jar
• F、 put Poker.jar in directory /stuff/java/games/cards， and set the CLASSPATH to include /stuff/java/Poker.jar