From the list of the effective teaching behaviours, identify those which are called key behaviours.

(i) Direct, audible and oral delivery to all students

(ii) Encouraging students to elaborate on an answer

(iii) Warm and nurturing relationships with learners

(iv) Varying modes of presentation

(v) Preventing misbehaviour with a minimum of class disruption

(vi) Organising what is to come and summarizing what had gone before