What must be done for compartments that could subject to fire?

The correct choice emphasizes the necessity of protecting compartments that could potentially experience a fire in accordance with the manufacturer's manual. This is crucial because the manufacturer's guidelines are specifically designed to ensure that the extinguishing system is effective and meets safety standards for the particular environment and application.

Proper protection involves installing and maintaining the dry chemical extinguishing system in ways that align with the designed specifications, which might include factors such as the type of materials present, the size of the space, and the potential hazards involved. By adhering to the manufacturer's recommendations, individuals establish a proactive approach to fire prevention, ensuring that the system functions optimally when needed.

Other options like monitoring only or exempting these compartments from protection would leave them vulnerable to fire risks, while claiming that no action is required would be neglectful of fire safety standards and compromises safety protocols.