What will the following API call return?

http://twitter.com/friends/ids/john.xml

It will return the id of john.

It will return the ids of all the friends of john.

It will return the ids of the mutual friends of john and the authenticating user.

It will return an error notification.

Answer:
It will return the ids of all the friends of john.

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What will the following API call return?http://twitter.com/friends/ids/john.xml