A Company's Collective Bargaining Agreement Has Expired and Negotiations Are

A company's collective bargaining agreement has expired and negotiations are underway for a new one.After one exhausting session,union leaders have decided management will not bargain in good faith.The union declares it will be going out on strike the following midnight if an agreement is not reached.The union

A) is allowed to go out on strike the following midnight.
B) must give the employer at least seven days' notice before going out on strike.
C) must give the employer at least 30 days' notice before going out on strike.
D) must give the employer at least 60 days' notice before going out on strike.