Which statement about Dalton's law of partial pressure is true?

The total pressure exerted by a mixture of gases is equal to the lowest pressure exerted by a gas in the mixture.

The total pressure exerted by a mixture of gases is equal to the sum of the partial pressures of the gases in the mixture.

The total pressure exerted by a mixture of gases is equal to the highest pressure exerted by a gas in the mixture.

The total pressure exerted by a mixture of gases is equal to the product of the partial pressures of the gases in the mixture.