Final answer:
A labor union is an organization of workers that negotiates as a group with employers over compensation and work conditions. Examples of labor unions include the IBEW, NEA, and AFT.
Thus, the correct answer is option 4.
Step-by-step explanation:
A labor union is an organization of workers that negotiates as a group with employers over compensation and work conditions. Some examples of labor unions include the International Brotherhood of Electrical Workers (IBEW).
The National Education Association (NEA), and the American Federation of Teachers (AFT).
Therefore, the correct answer is option 4) all of the above.