Which of the Indian plans provide a three-tiered constitutional structure to address the Indian problem before 1947?

Which of the Indian plans provide a three-tiered constitutional structure to address the Indian problem before 1947?

Explanation

The Cabinet Mission Plan, proposed in 1946, was a plan to establish a three-tiered federal government in British India: 

  1. Central government: Limited to power over defense, foreign relations, currency, and communication 
  2. Groups of provinces: Three groups, A, B, and C, focused on the three parts of India: Northwest India, Eastern India, and central portions of India 
  3. Individual provinces: Placed at the bottom of the structure