Which of the following statements differentiate teaching from learning?
    (a)    Teaching is a social act while learning is a personal act 
    (b)    Teaching implies learning
    (c)    Teaching is like selling while learning is like buying
    (d)    Teaching can occur without learning taking place    
    (e)    In teaching, influence is directed towards learning and learner, while in learning it is usually towards oneself
    Choose the correct answer from the following options :