Consider the following statements regarding the Greek influence on Punjab:

1. The Indo-Greek ruler Menander I (Milinda) is known for his interactions with the Buddhist sage Nagasena, recorded in ‘Milindapanha.’

2. Greek rule in Punjab introduced die-struck coins with bilingual inscriptions in Greek and Kharosthi scripts.

3. The city of Taxila was a major center of Greek learning and administration in Punjab.

4. Greek rule in Punjab completely disappeared after the Mauryan conquest.

How many of the above statements are correct?