Shifting cultivation is the example of subsistence farming. Subsistence agriculture is a self-sufficiency farming system in which the farmers focus on growing enough food to feed themselves and their entire families.Intensive farming is an agricultural intensification and mechanization system that aims to maximize yields from available land through variousmeans, such as heavy use of pesticides and chemical fertilizers. As Commercial farming and Organic farming are subset in intensive farming so, option (b), (c) and (d) are not correct in the given context as they do not fulfil the demands of the question.