Explanation:

- Correct Answer: Option 2 - Nursultan

- In March 2019, the capital of Kazakhstan, Astana, was renamed Nursultan in honor of the country’s long-serving president Nursultan Nazarbayev, who had recently resigned after nearly three decades in power.

- Option 1: NurNazar

- This name is not historically or politically associated with Astana's renaming.

- Option 3: Nazarbayev

- Nursultan Nazarbayev is the full name of the former president of Kazakhstan; however, the capital was not renamed as such.

- Option 4: Nurbayev

- This option does not relate to any historic figure or relevant event linked to the renaming of the capital.

Thus, Nursultan accurately reflects the honor bestowed upon the former president by renaming the capital.