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 relationship with learners. (iv) Varying modes of presentation.(v) Preventing misbehaviour with a minimum of class disruption. (vi) Organising what is to come and summarising what has gone before. Select your answer from the options given below: