Which of the following are tripartite bodies?
1. Indian Labour Conference
2. Standing Labour Committee
3. State Level Advisory Boards

A tripartite body is a committee or organization that consists of representatives from three different groups—government, employers, and workers—to ensure balanced decision-making in labor matters.

The Indian Labour Conference (ILC) is the apex tripartite consultative body in India that discusses labor-related issues.

The Standing Labour Committee (SLC) is a tripartite body that reviews and follows up on decisions taken in the ILC.

The State Level Advisory Boards are also tripartite in nature, as they include representatives from the state government, employers, and workers to address labor issues at the state level.

Since all three bodies involve representatives from these three sectors, the correct answer is "All of the above" (Option D).