menu activity and groups

<?php if ( is_user_logged_in() ) : ?>
[whatever menu items you wish to hide from public]
<?php endif; ?>

What i want to do is to hide or block activity, member and groups from non members.

I have used wordpress access plugin but it only hides pages you have created yourself rather than buddypress activity, member and groups.

So how do I put activity, member and groups in the above bracket. Do I use full stops or commas to separate them.

<?php if ( is_user_logged_in() ) : ?>
[activity, members, groups]
<?php endif; ?>

Please help. I will put this in the header above nav in buddypress.

Please help