Hide 'Discussions' link from appearing when user is not signed in

At the moment, the 'discussions' link is displayed in the menu when the user is not signed in. I want this to be hidden until the user signs in.
Any ideas as to how I can do this? I'm guessing some changes need to be made to the menu in the default.master.php, but I'm just not sure what?
Thanks in advance!
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There are links added with and without checking for a valid session... move this to the group that checks for the session.
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