One of these four answers does not represent an example of an employee who obtains a positive result because of labor unionization. Which one?

Group of answer choices

A high school graduate whose workplace is not unionized but whose industry is $25\%$ unionized is paid $5\%$ more than similar workers in less unionized industries.

A railroad union worker receives $2$ extra vacation days per year compared to non$-$union workers at the same railroad company.

A construction worker receives severance pay for being laid off.

A teacher who has joined the teacher's union in her district is given a $3\%$ pay increase over other non$-$union teachers in the school district.