From the list of statements given below identify those which most appropriately explain the purpose and effects of educational technology (ET). Choose your answer from the Codes given:

(a)    ET is a supplement rather than a substitute of teacher
(b)    ET is used with the intent of making instructions attractive
(c)    The purpose of ET is to optimise learning outcomes
(d)    Multimedia approach in ET ensures catering to diversity of learner characteristics
 (e)    Use of ET at preactive and post active stages is a kind of superimposition
  (f)    ET should lay more emphasis on software rather than hardware
    Codes :