51. What statement is true with regard to the basic operating principle of gravity associated with an oily- water separator?

The density of oil is less than that of water and as a result the oil droplets in an oily-water mixture will tend to rise.
The density of oil is greater than that of water and as a result the oil droplets in an oily-water mixture will tend to sink.
The density of oil is greater than that of water and as a result the oil droplets in an oily-water mixture will tend to rise.
The density of oil is less than that of water and as a result the oil droplets in an oily-water mixture will tend to sink.

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