From the following statements, concerning ideal gas at any given temperature T, select the correct.

(a)The coefficient of volume expansion at constant pressure is the same for all ideal gases

(b)The average translational kinetic energy per molecule of oxygen gas is 3kT, k being Boltzmann constant

(c)The mean-free path of molecules increases with an increase in the pressure

(d)In a gaseous mixture, the average translational kinetic energy of the molecules of each component is different