Assertion (A): The virial equation reduces to the ideal gas law at the limit of zero pressure. Reason (R): All correction terms in the virial series are multiplied by powers of $P$ or $1/V_m$ that vanish in this limit. Choose the correct option.

1. ABoth A and R are true and R is the correct explanation of A
2. BBoth A and R are true but R is not the correct explanation of A
3. CA is true but R is false
4. DA is false but R is true