Final answer:
Rotation of duties is the correct answer as it is not typically considered a method for protecting resources against environmental hazards, unlike fire alarms, waterproof ceilings, and voltage regulators.
Step-by-step explanation:
The question is asking which of the listed control plans would not typically be considered a method for protecting resources against environmental hazards. While fire alarms and smoke detectors, waterproof ceilings, and voltage regulators are all measures that can mitigate environmental risks, the rotation of duties is more commonly associated with administrative controls within a workplace to prevent fraud and errors, rather than environmental protection. Therefore, rotation of duties would be the exception among the options provided.