Implement the following methods (based on arraylists):
(a)- mergemethod that takes two arraylists as input and returns the merged arraylistcontaining the elements from both the input lists.
(b)-enumeratemethod that takes an arraylist as input and prints the enumerated contents of the input list.
(c)-reversemethod that takes an arraylist as input and returnsan arraylistwith the contents of input list in reverse orde