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