Consider the following statements
1. Nomadism is a high degree of spatial mobility as a basis for a particular ways life.
2. Nomadism is confined to the semi-arid regions of the world.
3. Nomadism is presumed to be a synonymous with movements of herds and livestock rearing.
4. Hunter gatherers who typically have no domesticated livestock are also defined as nomads.
Which of these are correct ?