What Are Some of the Concerns the Labor Movement Has

What are some of the concerns the labor movement has for workers regarding nonunion representation plans versus unions?

A) While it looks like a bilateral mechanism to employees,the formation,structure,nature,and continued existence of the plan is actually unilaterally controlled by management
B) Managers can parify the workers by occasionally giving the representation plan a "victory" without truly granting the employees any power
C) There is also the potential for management to convey subtle and not-so-subtle antiunion messages
D) All of the above