Which section of the Hindu Marriage Act, 1955 was challenged in Lakshmi Ammal v. Ramaswami Naicker?

Lakshmi Ammal challenged section 11’s restriction of the nullity petition to either party to the impugned marriage. As the first wife, she objected that she could not use that remedy against her husband’s second marriage. The Court rejected the Article 14 challenge and distinguished an ordinary declaratory suit. Thus section 11, rather than section 10, 12 or 13, is the provision asked.