An online class is a course conducted over the Internet. They are generally conducted through a learning management system, in which students can view their course syllabus and academic progress, as well as communicate with fellow students and their course instructor. The following portals include the list of 'on-line courses':1. swayam. gov. in:SWAYAM (Study Webs of Active€“Learning for Young Aspiring Minds) focuses on the access, equity, and quality of Education Policy. Its objective is to bring the best teaching and learning experience along with the resources to all, including the most disadvantaged in society. The use of indigenous developed IT platform facilitates hosting courses from the elite educational institutions in the country by anyone, anytime. It offers various online courses for school education and higher education. The courses are from Class 9th to post-graduation. The courses are available free of cost. SWAYAM portal has been developed by the Ministry of Human Resource Development along with NPTEL, IIT Madras, with inputs from Google Inc. and Persistent Systems Ltd. 2. nptel. ac. in:National Programme on Technology Enhanced Learning (NPTEL) is an Indian online learning platform for university-level science, technology, engineering, and mathematics subjects. It is jointly developed by the Indian Institutes of Technology and the Indian Institute of Science. The initiative is funded by the Ministry of Human Resource and Development, Government of India. The project's central idea is to put recorded lectures taught by its member institutes online for open access. It operates one of the most extensive educational Youtube channel covering engineering, basic sciences, and some humanities and social science subjects. Therefore, b and d only is the correct answer. 1. Atal Ranking of Institutions on Innovation Achievements (ARIIA) is an initiative of the Ministry of Education (MoE), Govt. of India to systematically rank all major higher educational institutions and universities in India on indicators related to €œInnovation and Entrepreneurship Development€ amongst students and faculties. 2. mic. ac. in: It is a portal of Mar Ivanios College established in 1949. The College is the first Institution in the University of Kerala to receive accreditation from the National Assessment and Accreditation Council (NAAC) in 1999. The College was also the first to be re-assessed and re-accredited with A Grade by NAAC in 2004.