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In the context of union organizing, a "salt" refers to a worker who acts as an organizer, specifically someone who is hired or placed in a non-union workplace with the intent of organizing workers and gaining support for union efforts. Salting is a strategic approach used by labor unions to foster union awareness, build relationships with employees, and encourage them to consider the benefits of collective bargaining. This practice helps unions expand their influence and increase membership in workplaces that are currently non-unionized.

The other choices do not accurately capture the meaning of "salt." A worker who is not unionized is simply someone without union membership; this does not imply any organizing role. A unionized worker with special privileges suggests a benefit for being part of a union, which does not pertain to the concept of salting. Lastly, a worker who opts out of union activities does not contribute to organizing efforts and thus is not aligned with the role of a salt in the union context.