Which of the following is an approach to explain consumer behaviour?

Both 2 & 3

Cardinal and ordinal utility analysis are two types of approaches for utility analysis.

1. Cardinal utility analysis measures the utility in the form of numbers. For example: 1 mango gives 50 utils of satisfaction.
2. Ordinal utility analysis measures the utility in the form of ranks. For example: Burger King is better than McDonalds, which means that Burger King has a better rank than McDonalds.