Which of the following indicates the mathematical expressions for Dalton's law of partial pressures

a) partial pressure =$\frac{\mathrm{The} \mathrm{component} \mathrm{volume}}{\mathrm{Total} \mathrm{Volume} }\times Total pressure$

b) Partial pressure = mole fraction of component gas × Total pressure

c) Partial pressure = Partial volume × Total pressure

d) Partial pressure = No. of moles of component gas × Total pressure