Web Forms :: 4.0 Menu - How To Control Rendered Ouput

I've specnt a day experimenting on this and am none the wiser.

I am using ASP.NET 4 Menu control and I have tried styling it using both techniques (but not at the same time as this is not recommended) i.e. :

(1) ASP.NET e.g.
<StaticMenuStyle BorderStyle="Solid" BorderWidth="1px" />

And

(2) CssClass e.g.
. StaticMenuStyle
{
/*my css rules here ... */
}

When I view the rendered output source in a Internet Explorer I see the following code in the HEAD section:

[Code]....

Also, in the BODY of the HTML I see the following:

<a title="Menu Option" class="level1" href="/path/default.aspx">Menu Option</a> (When using ASP.NET for styling)
<a title="Menu Option" class="level1 staticMenuItemStyle" href="/path/default.aspx">Menu Option</a> (When using CssClass)

I would like clean and minimal HTML rendered output (using AP.NET Web Forms not MVC).

I assume the #Menu1 and class="level1" is automatically generated.

Questions

(A) Is it possible to have the #Menu style code placed in an External style sheet file by ASP.NET at runtime rather than in the HEAD section of the output web page? If so, how is this done?

(B) Where is the code for class="level1" and do we have any control over this?