A seasonal movement of herdsmen with their livestock on mountain slope is known as:

Transhumance

The correct answer is Option (3) → Transhumance

• The process of migration from plain areas to pastures on mountains during summers and again from mountain pastures to plain areas during winters is known as transhumance.
• In mountain regions, such as Himalayas, Gujjars, Bakarwals, Gaddis and Bhotiyas migrate from plains to the mountains in summers and to the plains from the high altitude pastures in winters.
• Similarly, in the tundra regions, the nomadic herders move from south to north in summers and from north to south in winters