The process to be feasible, the entropy change, S2 – S1 of the system

Question

A system undergoes a state change from 1 to 2. According to the second law of thermodynamics, for the process to be feasible, the entropy change, S₂ – S₁ of the system                                                                            

      (a) is positive or zero

      (b) is negative or zero

      (c) is zero

      (d) can be positive, negative or zero