Explanation:

- The Industrial Policy Resolution of 1956 played a significant role in shaping India's industrial landscape.

- Industries were classified into three categories in this resolution.

- Category 1: Industries exclusively owned by the state, often referred to as the "schedule A" industries. These included sectors like railways, atomic energy, and defense.

- Category 2: Industries in which the state would play a dominant role, but private sector contribution was allowed. Often called "schedule B" industries.

- Category 3: Industries left to the private sector, with the state ensuring development through licensing and regulation. These were "schedule C" industries.

- Based on this classification, Option 3: 3 is the correct answer.

Option:3, 3