On occasions such as the marriages of deities, which images were used…

The correct answer is Option (2) → Special images, distinct from those in the central shrine

Option (1) The main image, carried out of the central shrine — Incorrect. The image in the small central shrine stayed in place; separate images were kept for these events.

Option (2) Special images, distinct from those in the central shrine — Correct. For music, dance, drama, divine marriages and swinging, the halls used special images kept apart from the small central shrine.

Option (3) Images brought from the shrines of the royal centre — Incorrect. These occasions belonged to temple life, and the special images were kept by the temple itself.

Option (4) Painted images hung on the inner walls of the gopuram — Incorrect. The images used were images of the deities placed in the halls, which were sculpted images kept for these events.