Which script block will display Hello World in the browser when the script is run?

<script type="text/javascript">
var message = "Hello ";
var message2 = "World";
document.write(message + message2);
</script>

<script type="text/javascript">
var message = "Hello ";
var message2 = "World";
document.write(message & message2);
</script>

<script type="text/javascript">
var message = Hello ;
var message2 = World ;
document.write(message + message2);
</script>

<script type="text/javascript">
var message = "Hello ";
var message2 = "World";
document.write("message + message2 ");
</script>