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Storing dangerous goods in a warehouse requires careful consideration of safety regulations and procedures. The correct answer highlights the necessity of obtaining the warehouse operator's approval before storing such materials. This is crucial because warehouse operators need to ensure that their facilities are equipped to handle hazardous substances safely.

Approval might involve assessing the storage capabilities, adherence to local and federal regulations, and the ability of the staff to manage emergency situations related to the dangerous goods. This oversight helps prevent accidents and ensures compliance with legal requirements concerning the handling of hazardous materials.

In contrast, the other options suggest less stringent regulations or assumptions about storage conditions that may not take into account safety practices or legal requirements. For instance, storing dangerous goods without any approval overlooks the need for safety measures, while claiming that they can only be stored if not prohibited ignores the necessity for proper management and safety protocols required by warehouse operators.

By requiring approval, the correct response emphasizes responsible practices for the storage of dangerous goods, prioritizing safety and compliance as essential components of warehouse operations.