4. Which of the listed pumping arrangements will be hazardous when two similar centrifugal pumps are used to discharge a cargo of flammable liquid?

Both pumps operating at the same speed and taking suction from a common line.
Each pump operating at a different pressure and discharging into a common line.
Each pump operating at a different speed and taking suction from a common line.
Both pumps operating at the same speed and discharging into a common line.

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