I registered a domain with Namecheap.com, and started the Google Apps registration process. After the initial data filling, google apps wishes me to prove the ownership of a domain, and has given me 4 choices:

• Add a DNS record to your domain's configuration
• Link to your Google Analytics account
• Upload an HTML file to your server
• Add a meta tag to your site's home page

What is the differences between these, and how do I (if someone knows perhaps how to do it on Namecheap, it would be even better) complete this step in the process?

I would appreciate any advice you might have.