no i'm not thinking that. myjar.jar has definitely got Foo in it. but just think what would be its hierarchy/directory structure in the jar file. if you can try jar -tf myjar.jar to see the structure of the jar. also look at the C option as well. by looking at the option , you can probably make out the difference.
this is what is difficult in exam . how much you can keep your cool and focus . believe me exam questions are not so tough. but we have to solve them with real exam pressure and all that stuff. good luck and good night