Arrange the following events in the correct sequence and select correct option.
1. Unification of Germany.
2. Acts of Union.
3. Unification of Italy.
4. Vienna Peace Settlement.
Choose the correct option :
(a) 1, 2, 3, 4
(b) 2, 3, 4, 1
(c) 2, 4, 3, 1
(d) 4, 3, 2,