Sam has been directed to study the demographic, economic, political, and cultural forces that affect an organization. In this instance, Sam has been directed to study the ________ of the organization. A: macroenvironment B: microenvironment C: internal environment D: marketing mix E: marketing intermediaries

In the thymus, thymic stromal cells(TSCs) are interconnected into a network structure. These cells carry a large number of surface molecules and can secrete a variety of thymic hormones and cytokines, which provides a suitable microenvironment for the development and maturation of thymocytes. The types of TSCs include ( ). A: epithelial cell B: macrophage C: dendritic cell D: neutrophil