Other rulers, such as the Shakas who came from Central Asia, were regarded as mlechchhas, barbarians or outsiders by the Brahmanas. However, one of the earliest inscriptions in Sanskrit describes how Rudradaman, the best-known Shaka ruler (c. second century CE), rebuilt Sudarshana lake. This suggests that powerful mlechchhas were familiar with Sanskritic traditions.

So, the correct option is [1].