Read the fragment below.

Several roles are assumed for teachers in Communicative Language Teaching, the importance of particular roles being determined by the view of CLT adopted. Teacher roles can be described in the following terms:

I - The teacher has two main roles: the first role is to facilitate the communication process between all participants in the classroom, but these participants should execute difficult and individual activities and texts.

II - The second role is to act as an independent participant within the learning-teaching group. The latter role is closely related to the objectives of the first role and arises from it.

III - These roles imply a set of secondary roles for the teacher; first, as an organizer of resources and as a resource himself, second as a guide within the classroom procedures and activities...

IV - A third role for the teacher is that of researcher and learner, with much to contribute in terms of appropriate knowledge and abilities, actual and observed experience of the nature of learning and organizational capacities.

(Jack C. Richards, Theodore S. Rodgers, Approaches and Methods in Language Teaching, 1999)

Observing the context, identify the correct items.