Which statement about secondary containment for RMW storage is correct?

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Secondary containment for RMW storage is about providing a safe, second barrier that can hold any leakage or spill from the primary container and prevent environmental or personnel exposure. The best answer notes that it must be compatible with the materials of the primary container, so it won’t react with or corrode when in contact with the waste. It should also be properly labeled, identifying the waste, hazard, and storage date, which helps with safe handling, inspection, and timely disposal. This combination ensures the containment will actually function in practice and complies with regulations. Other options miss the key purpose: odors are not the primary concern of secondary containment, it isn’t optional if the primary container is leak-proof, and in practice it’s needed during storage as well as during transport.