Answer: Extended
Explanation:
The extended problem solving variation is one of the process in which the customers are trying to get all the information which is related to the products and the specific brand for the buying purpose.
According to the given question, Kathy is searching online for buying the appliance that is washing machine and she comparing various types of features and the brands based on the model.
Based on the given scenario, the Kathy's purchasing is one of the example of extended problem solving variation where the customer does not aware about the brands and the actual features of the products.
Therefore, Extended problem-solving variation is the correct answer.