Consider the following statements regarding the nature of Yavana invasions and their Indian context:

1.      The Yavana invasions began after the political disintegration of the Maurya Empire.

2.    The Yavana invasions were confined to frontier regions and did not affect the Gangetic plains.

3.    Indian literary sources portray the Yavanas only as foreign plunderers.

4.   The Yavana invasions intensified political instability in North India.