Final answer:
The role needed to manage access to Azure Resources is the User Access Administrator. This role specializes in managing user permissions through Azure's role-based access control system.
Step-by-step explanation:
To manage access to Azure Resources, the role that is needed is the User Access Administrator. This role enables individuals to manage user access to Azure resources. The Owner role can also manage access permissions, but the User Access Administrator role is specifically focused on managing access through Azure role-based access control (RBAC).
Different roles define what actions a user can take within Azure. The Contributor role allows individuals to manage everything except access to resources. The Co-administrator role is a legacy role that provides the same access as the Service Administrator and is not recommended for use in managing access permissions in new Azure deployments.