The correct option "Only two pairs" is accurate because while Kamarajar Port is indeed recognized as the first major port in India to be registered as a company, Visakhapatnam is not the largest container port; that title is held by Mundra Port. Mundra Port, accurately listed as the largest privately owned port in India, qualifies as a correct match. This distinction is essential in UPSC Prelims, as it tests candidates' comprehension of critical maritime infrastructure and port classifications within India's economic framework, emphasizing the importance of accurate knowledge in general studies.