Migration is the process of moving from one place to another, either permanently or temporarily. It can be classified into different types based on various factors. In this question, the classification is based on the distance and destination of migration.

Two types of migration are:

1. Internal Migration - This type of migration refers to the movement of people within a country's borders. It can be further classified into:

- Rural to Urban Migration - This refers to the movement of people from rural areas to urban areas in search of better job opportunities, education, healthcare facilities, etc.
- Urban to Rural Migration - This refers to the movement of people from urban areas to rural areas in search of a peaceful life, lower cost of living, etc.
- Inter-state Migration - This refers to the movement of people from one state to another within the same country.

2. International Migration - This type of migration refers to the movement of people across international borders. It can be further classified into:

- Immigration - This refers to the movement of people into a country for permanent settlement.
- Emigration - This refers to the movement of people out of a country for permanent settlement in another country.

Therefore, the correct answer to this question is option 'A' - 2.