Select the correct option based on the statements below:
Assertion (A): Zirconium can be purified by the van Arkel method.
Reason (R): ZrI4 is volatile and decomposes at 1800 K.
  
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. (A) is false but (R) is true.