Answer:
The answer is: NONE OF THE ABOVE, the souvenir cup is a type of supplemental feature.
Step-by-step explanation:
The souvenir cup is a type of supplemental feature. It provides additional value to the core product. In this case the drink would be the core product and the cup would add value or attributes to it.
The cup is not part of a product line, nor it is the core product, it doesn't provide experiential benefits and is not a different product (brand extension).