Which of the following statements regarding NIPUN Bharat are correct?

1. It was launched in 2021 by the Ministry of Education to ensure foundational literacy and numeracy. 

2. The initiative targets children in the age group of 3 to 9 years, covering pre-school to Grade 3. 

3. It is implemented under the centrally sponsored Samagra Shiksha scheme.

4. A five-tier implementation structure at the National, State, District, Block, and School levels has been established for the mission across all States and Union Territories.

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