What Is the Opinion Given in Postal Clerks V

What is the opinion given in Postal Clerks v. Blount, regarding public sector employees' right to strike?

A) Public sector employees are entitled to their constitutional right to strike.
B) Public sector employees have the right to strike subject to a time limit.
C) Public sector employees can strike with the permission of the Supreme Court.
D) Public sector employees do not have the right to strike.