Strikes, the Legal Weapon of Last Resort in the Procedures

Strikes, the legal weapon of last resort in the procedures employed by unions in the private sector, are, for government employees at the state and local level,

A) legal in only twelve states and only for "nonessential" services.
B) legal in all states and commonly used by public employees to get higher wages and better working conditions.
C) legal under the National Labor Relations Act and legal under most public union collective bargaining agreements.
D) illegal in only twelve states.