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MetroSteel Philippines, a private steel manufacturer with 480 employees, is represented by the MetroSteel Workers Union (MSWU), its exclusive bargaining agent. After months of bargaining over a new collective bargaining agreement focusing on overtime premium and night-shift differential, MSWU calls a three-day peaceful strike with a picket line at the main gate and a partial work stoppage in four of eight production lines. The union has given written notice to the employer and to the Department of Labor and Employment, and has sought assistance from the National Conciliation and Mediation Board (NCMB) to resolve the dispute. There is no violence or property damage; production in the affected lines is paused while other lines continue. Management contends the strike is unlawful for two reasons: (i) the issues concern overtime premium and scheduling, which the employer claims are corporate policy rather than terms and conditions of employment; and (ii) a partial stoppage in only a portion of the plant renders the strike unlawful. Which of the following statements best describes the controlling doctrine and the likely legal outcome?