In Indian history, the pairs provided are largely linked to their respective philosophical and religious contributions. Aryadeva is primarily recognized as a Buddhist scholar rather than a Jaina scholar; hence, the first pair is incorrect. Dignaga, known for his work in logic and epistemology, is accurately matched as a Buddhist scholar, while Nathamuni is correctly identified as a prominent Vaishnava scholar, credited with the revival of the Ashtakshara Mantra and enriching Vaishnavism. Thus, only the pairs involving Dignaga and Nathamuni are correctly matched, making the option "Only two pairs" accurate. This illustrates the importance of accurately identifying the contributions of historical figures within their proper religious and cultural contexts, a key focus in UPSC exams.