An entrepreneur establishes a social justice online retail company. The company purchases authentic artwork, jewelry and crafts at a fair price from artisans in developing countries and then sells them through a website. As a company following a differentiation strategy, which of these functional-level strategies will be important for sustaining the business?a. Developing a robust marketing program to promote the social justice elements of the business and gain insights into consumer purchasing behavior on the websiteb. Leveraging its purchasing power to pressure artisans into selling their goods at a reduced pricec. Adopting a lean manufacturing technique to reduce production costsd. Incentivizing employees with bonuses for cutting costs within the operation