Match list I with list II.        List I                              List II (a) Rectifier                 (i) Used either for stepping up or stepping down the a,c voltage  (b) Stabilizer              (ii) Used to convert a.c voltage into d.c voltage  (c) Transformer         (iii) Used to remove any ripple in the rectified output voltage    (d) Filter                       (iv) Used for constant output voltage even when the input voltage or load current change  Choose the correct answer from the options given below