With reference to the invaders in ancient India, which one of the following is the correct chronological order?

1. The question asks for the correct chronological order of invaders in ancient India among the given groups. 2. The Indo-Greeks (successors of Alexander the Great's invasion) established kingdoms in northwestern India from the 2nd century BCE. 3. The Sakas (Scythians) invaded after the Greeks, establishing their presence in northwestern and western India from around the 1st century BCE onwards. 4. The Kushans (Yuezhi people) followed the Sakas, establishing a large empire covering parts of Central Asia and northern India, flourishing from the 1st century CE. 5. Therefore, the correct chronological order is Greeks -> Sakas -> Kushans.