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Q6. (a) What is the primary regulatory driver for installing scrubber systems in modern shipping? (4)

(b) A container ship operating on high-sulfur fuel oil (HSFO) paired with an open-loop scrubber enters a designated zero-discharge port zone. Detail the operational switch the crew must make, explain the compliance risks of failing to transition, and discuss the economic trade-off between using compliant low-sulfur fuel (VLSFO) versus running a scrubber system. (12)