Explanation:

- Connectedness: This refers to building strong relationships between employers and employees. It helps in creating harmony, but it's not a primary objective of industrial relations.

- Collective wisdom: This means using the combined knowledge of both workers and management. While valuable, it is not a stated core objective of industrial relations.

- Conflict prevention: Preventing and managing conflicts is a central objective of industrial relations.

- None of the above: This would be correct only if all the above were primary objectives, which they are not.

Correct Answer: Option 2 - Collective wisdom is usually not a main objective of industrial relations.