Answer:
D) fuzzy logic
Step-by-step explanation:
Based on the information provided within the question it can be said that the category of intelligent technique that is being described is called fuzzy logic. This refers to a system which deals with true or false statements as well as in between statements in order to follow specific instructions. Which would be the case in this scenario as the oven analyzes the food in order to detect the rarity of the food and decide which pre-defined instruction to follow next, even if the rarity is between two categories such as medium rare and rare.