One of the key concepts in Wallerstein's world-system theory is the idea of "dependence." Which of the following BEST describes the nature of dependence in the context of core-periphery relations? Group of answer choices Core nations are dependent on periphery nations for cultural exchange. Semi-periphery nations are politically dependent on core nations. Periphery nations are technologically dependent on semi-periphery nations. Periphery nations are economically dependent on core nations.According to Wallerstein, what is the role of the periphery in the world-system? Group of answer choices Serving as the economic powerhouse of the global economy Acting as a mediator in conflicts between core and semi-periphery nations Providing resources and labor to support the economic activities of the core Developing advanced technological innovations independently of the core