The correct option is "1 and 3 only" because the Ethics Committee of the Lok Sabha was indeed established initially as an ad-hoc committee, reflecting a temporary framework to address ethical issues among members. Additionally, the principle that the committee cannot address matters that are sub-judice ensures the separation of legislative ethics from judicial processes, maintaining the integrity of parliamentary proceedings. However, the notion that only a member of the Lok Sabha can file a complaint is not entirely accurate, as complaints can also arise from other sources, which makes statement 2 incorrect. This understanding highlights the unique role of the Ethics Committee in upholding parliamentary decorum and ethical standards within the legislative framework.