What's the best way to add google adsense code?

[Pricky]

I have researched on fourm and found few things,

1. Admin Panel >> Content Boxes > Add a Box >Box Type - Smarty >Position - Header Banner

{literal}
Put your js google code here
{/literal}

2. Admin Panel >> Content Boxes > Add a Box > Box Type - HTML >Header Banner

3. or With Banners Plugin? (I have banners plugin)

I wanted to show the google ads on header banner & sidebar like our demo site.