Sub Domain Configuration

As an IT company, we've had major issues in the past getting a store indexed by Yahoo (the primary URL) and we believe the domain configuration is the culprit.

Yahoo's store help offers the following vague descriptions of their domain forwarding options:

Can anyone elaborate on which option works like a permanent 301?

I'm inclined to believe it's the Standard forwarding option, but the destination address is a yahoo store (yahoo hosted), so is the 3rd option a valid choice?

Yahoo domain forwarding options:

• Standard forwarding: The domain name redirects to a web address that you specify (usually hosted by another provider), and visitors will see the destination web address in the address bar of their web browsers.
• Masked forwarding: The domain name redirects to a web address that you specify (usually hosted by another provider), and visitors will see the original domain name in the address bar of their web browsers.
• Forwarding to a Yahoo Hosted site: The domain name redirects visitors to a Yahoo-hosted web site you specify; visitors see the original domain name in the address bar of their web browsers. Choosing this option allows you to create subdomains with a Domains or Business Email plan. Learn more about subdomains.