I have a block in a sidebar with 3 menu items. Call them A, B, and C.

1) A is available to authenticated users.  It allows them to create new groups once they are authenticated. Creating a group automatically promotes the creator to being a group member and a group admin.

2) B is available to authenticated users, who are members of or have created one group at least. It allows them to post to a group.

3) C is available to authenticated users, who are members of or have created one group at least. It allows them to invite users to the group.

How do I conditionally give authenticated users access to links on the basis of their roles within the same block (and not separate blocks)?

What I have found so far is that either the entire block is visible or invisible. What I want instead is that some of the links should be present under certain conditions while at other times not.

Moses