Regarding the main proposals of the Cabinet Mission Plan, consider the following statements:

1. Grouping of existing provincial assemblies into three sections.

2. Three-tier executive and legislature at provincial, section, and union levels.

3. Provinces were to have full autonomy and residual powers would be with the Centre.

4. Princely states were to be under the paramountcy of the British government.

How many of the statements given above are correct?