Internal energy of a gas obeying Van-Der-Waals equation of state, [p + (a/v2)] (V - b) = RT, depends upon its
(A) Pressure & temperature
(B) Pressure & specific volume
(C) Temperature & specific volume
(D) Temperature only
(A) Pressure & temperature
(B) Pressure & specific volume
(C) Temperature & specific volume
(D) Temperature only