Answer: Multi-attribute attitude model
Explanation:
The Multi-attribute attitude model is one of the type of marketing based model in which the it helps in determine the customer's attitude towards the various types of products, brands and the services in the market.
The main function of the Multi-attribute attitude model is to identifying the specific belief and the perception of the person that helps in measuring overall customer's attitude towards the goods and the services.
According to the given question, Duane is using the Multi-Attribute attitude model for determining the customer's attitude towards his restaurant by perform various types of attributes like food quality and price.
Therefore, Multi-attribute attitude model is the correct answer.