educational services, namely, conducting courses of instruction in the field of corporate training and in the fields of business administration, community counseling, computer/information systems, cultural diversity, education/teacher certification, energy and environmental quality management, financial planning, human behavior, humanities, law enforcement/security administration, medical laboratory technology, office technology, public administration, quantitative studies, social science, technology/engineering management, telecommunications management, communications, customized job skills, employee relations, leadership, management, marketing/sales, and public relations, for the primary, secondary, post secondary and graduate levels, for home or group study, provided through a global computer network, cable television transmission, and direct broadcast satellite transmission