With reference to the life of Gautama Buddha, consider the following statements:

I. The “Four Sights” included an old man, a sick person, a corpse, and an ascetic.

II. He attained enlightenment at Sarnath.

III. His first sermon is known as Dhammachakrapravartana.

IV. He attained Mahaparinirvana at Kushinagara.

Which of the statements given above are correct?