What is the main focus of passive containment strategies?

The main focus of passive containment strategies lies in minimizing risk through design and layout. This approach emphasizes creating systems and structures that inherently contain potential spills or leaks, even before they occur. By utilizing materials, designs, and configurations that reduce the likelihood of a release, passive containment strategies aim to prevent environmental impacts at the source. This proactive design minimizes the need for immediate response actions, as the risk of spills is significantly lowered through careful planning and layout of facilities and equipment. The emphasis is on long-term safety and risk mitigation rather than reactive measures or ongoing maintenance, making this choice the most relevant to the question's intent.