Cadia Foods Inc. was the first company to start selling energy drinks in its country$$a product that gained popularity among diverse groups. Soon, other companies started to sell their own brands of energy drinks, thereby giving Cadia Foods ample competition. In response, Cadia Foods decided to limit its variety of energy drinks to only two. However, it ensured that these two flavors were free of calories and low in cost$.$ With this innovation, Cadia Foods Inc. has consistently outperformed its competitors for the past ten years.

In this scenario, Cadia Foods Inc. has maintained $\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$ through its innovative strategy.

Question $15$ options:

Economies of scale

Complementary products

Experience$-$curve effects

A sustainable competitive advantage

None of the above