Arrange the following in correct sequence of import procedure.
1. Pre-import procedures are followed
2. Legal dimension of import procedure are checked
3. Retirement of import documents
4. Custom clearance for imported goods
5. Warehousing the goods
6. Import follow-up

A. 1, 2, 4, 3, 5, 6

B. 1, 2, 3, 4, 5, 6

C. 1, 3, 2, 4, 5, 6

D. 1, 4, 2, 3, 5, 6

Answer: Option B