Consider the following statements and point out which statements are related to Positivism
    (a)    Laws are command
    (b)    Analysis of legal concept is distinct from Sociological and Historical analysis 
    (c)    Decisions can be deducted logically with recourse to morality
    (d)    The 'Law as it is' has to be kept separate from 'Law ought to be'
    Choose the correct option :