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