The option "2 and 3" is correct because both the Huchimalligudi Temple in Aihole and the Dashavatara Temple in Deogarh exemplify the Nagara architectural style, characterized by their towering shikharas or spires shaped in a curvilinear form. The Nagara style is predominantly found in northern India and is marked by intricate stone carvings and elevated shikhara that symbolize the merger of earthly and divine realms. In contrast, the Malegitti Shivalaya and Virupaksha Temple exhibit Dravidian architectural features, with distinct flat-roof structures and pyramidal shikharas, emphasizing the regional diversity in temple designs across India.