The correct answer is: A mix and balance of team roles
Rationale: This should be straightforward if you have understood the Belbin model. A healthy team has a mix and balance of roles.
However, members can adopt more than one role, or switch roles as required: there need not be nine members with fixed roles. Belbin argues that it is the process roles (how people behaviour, contribute and interact with others), rather than the functional roles (technical skills and operational knowledge) that impact on team functioning - although functional roles are still important for getting the task done!
