Which of the Following Is True of Federal Employees and Labor

Which of the following is true of federal employees and labor unions?

A) Federal employees are prohibited from forming labor unions.
B) Federal employees can form labor unions,but their unions by law have limited authority.
C) There are no restrictions on the creation and powers of labor unions by federal employees.
D) Among federal employees,only employees of government corporations can legally form labor unions.
E) Federal employees can form labor unions but are not allowed to participate in collective bargaining.