Click here and search the article for '2 out of 3' without the quotes; in the case of forgotten answers, this generally involves either a message being sent to your rescue email address or contacting the iTunes Store staff directly.
1. See my User Tip for some help: Some Solutions for Resetting Forgotten Security Questions: Apple Support Communities.
2. Here are two different but direct methods:
a. Send Apple an email request at: Apple - Support - iTunes Store - Contact Us.
b. Call Apple Support in your country: Customer Service: Contacting Apple for support
3. For other queries about Apple ID see Frequently asked questions about Apple ID.