Which of the following domain trust types does not extend beyond the trusted and trusting domains?

Which of the following domain trust types does not extend beyond the trusted and trusting domains?

• Shortcut
• Forest
• Internet
• External             

EXPLANATION

An external trust provides access to resources located on an NT4 domain or a domain in a non-trusted forest. It is not transitive.
Forest trusts provide access to resources in any domain in the forest. Forest trusts are transitive.
Shortcut trusts are used to improve user login times between two domain in a forest. These trusts are also transitive.
Internet trusts do not exist

SOURCE

https://technet.microsoft.com/en-us/library/cc730798(v=ws.11).aspx