| Closed freight containers and closed cargo units are used in the shipment of freight. Which of the following defines these terms? |
| A) a freight container in which the contents are enclosed by rigid surrounding walls |
| B) a freight container in which the contents are enclosed by permanent structures |
| C) a freight container in which the contents are enclosed by fabric sides, top and secured with a locking cable |
| D) a freight container in which the contents are enclosed by permanent structures on the sides and a plastic or fabric top |
