Symbiotic marketing refers to a marketing strategy for the purpose of reducing costs, improving efficiency, and enhancing market competitiveness by two or more companies sharing resources in marketing. According to the above definition, which of the following is symbiotic marketing? ['Enterprise A and Enterprise B decide to integrate resources and establish an enterprise group.', 'A. B, and C three small home appliance companies decided to establish a market consumption information sharing mechanism, and regularly notified and coordinated the variety, quality and price positioning of their respective small home appliances.', "A logistics company transports the goods from A to B, and then from B to A. and does not empty back and forth, which improves the company's efficiency.", 'A shopping mall sells products of both company A and company B.']