Regarding question about 'main.class'

[yogesh.jankin]

Hi Admin,

For the below question, please let me know why option 2 is wrong as I'm able to compile it without error:

The options below contain the complete contents of a file (the name of the file is not specified). Which of these options can be run with the following command line once compiled?
java main

Option 2 is :
//in file main.java    
public static void main4(String[] args) {       
 System.out.println("hello");    }

Thanks,Yogesh.

[admin]

The question asks you to run it as well.