Explanation:

- Shifting Cultivation: This is a type of farming where plots of land are cultivated temporarily, then abandoned and allowed to revert to their natural vegetation while the cultivator moves on to another plot.

- Option 1, Podh: Not a widely recognized term in the context of shifting cultivation among the tribes of Assam.

- Option 2, Jhum: Correct term for shifting cultivation practiced by many tribes in Northeast India, including Assam. It involves clearing of forested areas, burning wood and debris, and using the ash as fertilizer.

- Option 3, Koman: Not commonly associated with shifting cultivation in this context.

- Option 4, None of the above: Not applicable as Option 2 is the correct choice.