Which of the following statements regarding compressibility factor (Z) is/are correct :
(A) In the lower pressure region, value of $Z$ decreases on increasing pressure, however $H _{2}$ and He gases are exception to this.
(B) $Z$ for an ideal gas is greater than one.
(C) $Z$ for a non-ideal gas can be greater than or less than unity depending on temperature and pressure.
(D) When $Z<1$, intermolecular attraction dominates over intermolecular repulsion.
