Which of the following are valid main method deceleration?

In Last Post we saw that Main method about..Now,

1. public static void Main(String args[])
2. public static int main(String args[])
3. public static void main(String args)
4. public final synchronized strictfp void main(String[] args)
5. public static final synchronized strictfp void main(String[] args)
6. public static void main(String... args)

Please, write answer in comment box.....