Heirloom Furniture is a brand reputed for its wide variants of sofas that introduced a new range of mattresses and bed frames a few years ago. Since most of its products could be produced using the same resources and technology, the company's cost structure lowered, while its product portfolio widened. In this scenario, which of the following value and cost drivers is Heirloom applying?A) mass customizationB) economies of scopeC) learning-curve effectD) network effect

Economic models a. are constructed to mirror reality as closely as possible, and in this respect economic models are no different from other scientific models. b. are constructed to mirror reality as closely as possible, and in this respect economic models are very different from other scientific models. c. are simplifications of reality, and in this respect economic models are no different from other scientific models. d. are simplifications of reality, and in this respect economic models are very different from other scientific models.