Which of the following statement is correct regarding Alexander’s invasion?
1
Alexander conquered whole of Persia by defeating Darius - II in the Battle of Arabela.
2
Porus wrote that fabulous wealth of India attracted Alexander & moreover his interest in Geographical enquiry & love of natural history urged him to invade India
3
The army of Ambhi, the ruler of taxila and Porus jointly fought with army of Alexendra.
4
Alexander’s invasion encouraged the political unification of north India under the Mauryan ruler.