Sam's Club and Costco have membership fees. Once the fee is paid, the member can buy products from these stores at relatively low prices. The type of pricing the managers of these stores are using is How should Costco and Sam's Club managers set the prices of the products they sell? O A. They should price all their products above their marginal costs when both the stores have non identical demands. O B. They should price less elastic products above their marginal costs and more elastic products below their marginal costs when both the stores have non identical demands. O C. They should price more elastic products above their marginal costs and less elastic products below their marginal costs when both the stores have non identical demands. O D. They should price all their products at their marginal costs when both the stores have non identical demands