What is the path of the Host HTML page that loads our GWT app ? (new to GWT)

I have to add ext-js script tags in the Host HTML page that loads my GWT app. I am migrating this application (Xxx) from GWT 1.7.0 to GWT 2.7.0.

<script src="js/ext/adapter/ext/ext-base.js"></script> and
<script src="js/ext/ext-all.js"></script>

My application has Xxx.html pages in 4 different locations; (Xxx is my application name);
which one of the following is the right place to add ext-js script tags ?

1. XxxApp/build/com.acg.xxx.gwt.Xxx
2. XxxApp/src/com/acg/xxx/gwt/public
3. XxxApp/war/com.acg.xxx.gwt.Xxx
4. XxxApp/WebContent

Can someone please help me?

Thank you in advance.

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