Virial equation is: `PV_(M)=RT[A+(B)/(V_(M))+(C )/(V_(M^(2)))+…]`, where `A`, `B`, `C`, …. are first second,third, … virial coefficent, respectively, For an ideal gas
A. `A=` unity and `B,C` are zero.
B. `A,B,C` are all equal to unity
C. `A` is dependent of temperature
D. All `A,B,C` depend on temperature.