Consider the following statements regarding workforce restructuring in Punjab’s rural economy:

1. Punjab’s rural economy has transitioned from self-employment in agriculture to a mix of casual farm and non-farm employment.
2. The share of agricultural employment in Punjab declined significantly between 1983 and 2001.
3. The introduction of capital-intensive farming techniques has increased employment opportunities in agriculture.
4. Rural households have diversified into non-agricultural sectors due to declining farm incomes.

Which of the above statements are correct?