2. Regarding the high-pressure pump of a reverse-osmosis freshwater generator, what statement is true?

The high-pressure pump is typically a two-stage centrifugal pump, but may be a two-stage rotary pump.
The high-pressure pump is typically a single-cylinder reciprocating pump, but may be a single-stage centrifugal pump.
The high-pressure pump is typically a multiple-cylinder reciprocating pump, but may be a multi-stage centrifugal pump.
The high-pressure pump is typically a two-stage rotary pump, but may be a two-stage centrifugal pump.

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