| Which of the following describes the difference between a closed freight container and an open freight container? |
| A) a closed unit encloses its contents with a permanent structure and the open unit does not |
| B) a closed unit encloses its contents with a semi-permanent structure and the open unit does not |
| C) an open unit encloses its contents with a permanent structure and has an access door that the closed unit does not have |
| D) an open unit encloses its contents with a semi-permanent structure and the closed unit does not |
