Answer: Product invention
Explanation: Every unique product concept that springs to mind and contributes to the construction of a new product or the alteration of a existing design. Product development is the design of new offerings and system innovations.
In the given case, the company is diversifying its product by offering new flavors in the market that are unique in nature. Their core product is same but they are producing new and innovative varieties.
Thus, we can conclude that the given case depicts product invention.