See the given code of JavaScript and choose the correct output from the following
<ol class="dp-xml" start="1">
 	<li class="alt">var <span class="attribute">string1</span> = <span class="attribute-value">"40"</span>;</li>
 	<li class=""><span class="attribute">var intvalue</span>=<span class="attribute-value">50</span>;</li>
 	<li class="alt">alert( string1 +intvalue);</li>
</ol>