Which of the following pairs about Vijayanagara structures is correct…

The correct answer is Option (2) → Mahanavami dibba - remains an enigma, like some other buildings of the royal centre

Option (1) Lotus Mahal - name given by Portuguese travellers in the sixteenth century — Incorrect. The Lotus Mahal got its name from British travellers in the nineteenth century, long after the Portuguese visits.

Option (2) Mahanavami dibba - remains an enigma, like some other buildings of the royal centre — Correct. Scholars cannot say for sure that the mahanavami dibba was the centre of the festival. Like some other buildings of the royal centre, it remains an enigma.

Option (3) Elevation - a view of a structure seen from directly above — Incorrect. A view from above is a plan. An elevation is a vertical view of a structure, showing features a photograph may miss.

Option (4) Mahanavami dibba - known from inscriptions as the king's audience hall — Incorrect. No inscription names the platform. Its purpose is still uncertain, which is why it is called an enigma.