The correct answer is option 'D' - None of the above.

Shifting cultivation, also known as slash-and-burn agriculture, is a traditional agricultural practice where farmers clear a patch of land, burn the vegetation, and then cultivate crops on the cleared land for a few years. After the soil fertility decreases, they move to a new plot of land and repeat the process. This cycle of clearing, burning, and cultivating is repeated over and over again.

Let's analyze each option given:

a) Jhumming:
- Jhumming is another term for shifting cultivation and is commonly practiced in the northeastern states of India, especially in states like Nagaland, Mizoram, and Meghalaya.
- It involves clearing and burning the vegetation on a plot of land, followed by cultivation for a few years before moving to a new plot.

b) Podu:
- Podu is also a form of shifting cultivation, primarily practiced by tribal communities in the states of Andhra Pradesh, Telangana, and Odisha.
- Similar to jhumming, it involves clearing, burning, and cultivating a plot of land for a few years before shifting to a new one.

c) Bewar:
- Bewar is another term for shifting cultivation and is practiced in the state of Madhya Pradesh.
- It follows the same pattern as jhumming and podu, where land is cleared, burned, and cultivated for a specific period before moving on to a different plot.

Therefore, all the options mentioned in the question - jhumming, podu, and bewar - are types of shifting cultivation. Hence, the correct answer is option 'D' - None of the above.